What methods can you use to secure a 2nd trailer before coupling?

I'm using the Georgia Commercial Drivers Manual to study to get the doubles and triples endorsement on my GA CDL. Henceforth, I will refer to the Georgia Commercial Drivers Manual as the GA CDL Manual for brevity. The GA CDL Manual Section 7 is about Doubles and Triples. There is a quiz at the end of section 7. Here is a photograph I took of the quiz at the end of section 7:



The third question is the following: "What three methods can you use to secure a second trailer before coupling?"

The only part of section 7 that seems to address this issue is section 7.2.1, which is subtitled "Secure second (rear) trailer".

Here is a photograph of section 7.2.1 in the Georgia CDL Manual:

To me, the question "What three methods can you use to secure a second trailer before coupling?" asks for three distinct methods of securing the rear trailer, but I think maybe the question just asks for the three STEPS to do one method of securing the rear trailer.

Another possibility that occurred to me is that maybe the study guide is literally asking for three distinct methods of securing the rear trailer. Maybe the first method is that the rear trailer is already secure if the rear trailer has spring brakes. Maybe the second method is to drive the tractor close to the trailer, connect the emergency line, charge the trailer air tank, and disconnect the emergency line (which would set the trailer emergency brakes). Maybe the third method is to just chock the wheels.

What is your interpretation of the meaning of the question "What three methods can you use to secure a second trailer before coupling" based on what you read in section 7.2.1.? Do you think that the question is really just asking for three steps to do one method of securing the rear trailer? Or do you think that the question is actually asking for three distinct methods of securing the rear trailer (with the answer being what I wrote in orange text)?

 

The second photograph I posted listed the following steps for securing the second (rear) trailer: "If the second trailer doesn't have spring brakes, drive the tractor close to the trailer, connect the emergency line, charge the trailer air tank, and disconnect the emergency line. This will set the trailer emergency brakes (if the slack adjusters are correctly adjusted)."

Are the "trailer emergency brakes" the exact same thing as what kylefitzy calls the "air applied parking brakes"?
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P.S. do any big rigs in the real world nowadays (not at a truck driving school) really pull any trailers built before 1975?

 

kylefitzy, are the trailer emergency brakes the exact same thing as the air applied parking brakes?