Device interconnection (such as point-to-point links) requires only two IP addresses: one for each device.
A subnet mask of /30 (255.255.255.252) provides four total addresses (2 usable, 1 network, 1 broadcast).
Efficiency:
Using a /30 subnet avoids wasting IP addresses, making it ideal for point-to-point links.
Why Other Options Are Incorrect:
B (32): /32 is used for single-host IP addresses, not links.
C (24): /24 is excessive for point-to-point links, providing 254 usable addresses.
D (16): /16 provides 65,534 addresses, which is highly inefficient.
References: HCIA-Datacom V1.0 Certification Guide, Chapter 3: IP Addressing.
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