Which item category must you use for subcontracting?

You want to collectively convert assigned purchase requisitions into purchase orders.
How can you do this?
Note: There are 3 correct answers to this question.

which of the following actions can an end user perform with filtered report results in an SAP Fiori app?
Note : There are 3 correct answers to this question

You send newly created POs to supplier via EDI. whereas quantity or price changes are to be transmitted by email. What prerequisites must be met if you are using the condition techniques for message determinations NOTE: There are 2 correct answers to this question

For Which type of contracts can you use item category Material Group (W)