Which network should you use to obtain the most efficient usage of IP address space?

You have a requirement to configure two new network ranges. One of these networks requires
200 IP addresses and the other requires 600 IP addresses. Which network should you use to
obtain the most efficient usage of IP address space?

A.
10.12.60/24 and 10.12.48/21

B.
192.168.2/24 and 192.168.3.0/23

C.
10.10.10/24 and 192.168/16

D.
10.12.53/24 and 10.12.48/22