Which of the following statement is correct with reference to activity type?

It classifies the specific activities provided by a cost center along cost allocation line.

It serves as tracing factor for this cost allocation.

The system calculates the associated cost based on the activity price and generates a credit to the receiver and a debit to the sender for both the quantity and the costs.

The internal activity allocation is carried out via primary cost elements, which are stored in master data of the activity type master record.