The List-I (lists the attributes) and the List-II (list of the modulation systems) are given. Match the attribute to the modulation system that best meets it.
List-I
A. Power efficient transmission of signals
B. Most bandwidth efficient transmission of voice signals
C. Simplest receiver structure
D. Bandwidth efficient transmission of signals with significant dc component
List-II
1. Conventional AM
2. FM
3. VSB
4. SSB-SC
A B C D
(a) 4 2 1 3
(b) 2 4 1 3
(c) 3 2 1 4
(d) 2 4 3 1