Communication Systems - Engineering

Q1:

Consider the following statements as regards IF in radio receivers
  1. If IF is too high, poor selectivity and poor adjacent channel rejection could result
  2. If IF is high, tracking difficulties increase
  3. A very low IF makes selectivity too sharp
  4. As IF is decreased, image frequency rejection becomes better
Which of the above are correct?

A 1, 2, 3, 4

B 1, 2, 3

C 2, 3, 4

D 1, 3, 4

ANS:B - 1, 2, 3

No answer description is available.