What is necessary to make them functional?

Newly created subplaybooks do not have any inputs, or outputs.

What is necessary to make them functional? (Choose two.)
A . Define input key in the subplaybook task. Map context values to pull from parent playbook.
B . The output of the previous task automatically becomes the input of the subplaybook.
C . Map inputs and outputs to the parent playbook and the subplaybook will use the same
values.
D . Open the subplaybook and add inputs or outputs in the Playbook triggered task.

Answer: A,D