Delay of the resource allocated on demand during data transfer

Delay of the resource allocated on demand during data transfer is ________

A. constant

B. increases for each packet

C. same for each packet

D. different for each packet

I had been asked this question during an internship interview.

I want to ask this question from Virtual Circuit in portion Frame Relay of Computer Network

The correct answer is D. different for each packet

Best explanation: If a resource is to be allocated on demand during the data transfer phase, the delay for each packet would be different depending upon the resource requirement of the packets.