The following logic families have their propagation delay. Arrange them from lowest

propagation delay to highest propagation delay.

1. TTL (Standard)

2. ECL

3. Low power CMOS

4. DTL

(A) 2, 1, 4 and 3 (B) 2, 4, 1 and 3 (C) 4, 2, 3 and 1 (D) 1, 2, 3 and 4