How do you start a JDAPI session in default mode?

How do you start a JDAPI session in default mode?

A.
You must use the Jdapi.startup() method.

B.
You must take a call to the FormModule constructor.

C.
The first functional call made to JDAPI starts the session in default mode.

D.
You must use Jdapu.shutdown() to close all open session and then use Jdapi.startup() to start the session in default mode.