In network that support VLSM, which network mask should be used for point-to-point WAN links in order to reduce waste of IP addresses?

In network that support VLSM, which network mask should be used for
point-to-point WAN links in order to reduce waste of IP addresses?

A. /24
B. /30
C. /27
D. /26
E. /32
Answer: B
Explanation:

A 30-bit mask is used to create subnets with two valid host addresses. This is the exact number needed for a point-to-point connection.