Communication Systems - Engineering

Q1:

Some desirable features of a computer communication network are
  1. It should accept an intended transmission without excessive delay
  2. The data arriving at a receiving point should be processed rapidly
  3. When a transmission calls for a response, the delay of response should be minimum.
Which of the above are true?

A 1 and 2 only

B 1 and 3 only

C 1, 2, 3

D 2 and 3 only

ANS:C - 1, 2, 3

All the three features are necessary.