What determines whether the planned independent requirements in MRP consume other requirements?

In which data object is the production line (Repetitive manufacturing relevant work center) maintained?
Please choose the correct answer.
Response:

The material master of your finished product contains MRP type "PD". You set a manual firming date in the stock requirements list. Which of the following will firm planned orders" There are 2 correct answers to this question.
Response:

What could be the reason for multiple commitment of individual capacities, where several operations have the same scheduled dates on a resource after capacity planning? Note: There are 2 correct answers to this question.

Your project uses process orders for the production of liquid chemicals. What can you define to ensure that the production flow happens only in physically connected tanks?