Given an 8-floor office with ~30–40 users per floor and only one subnet allowed, which SVI address and mask is the most efficient use of 192.168.0.0?

The correct answer, ip address 192.168.0.0 255.255.254.0, provides a subnet with 510 usable host addresses. With 8 floors and 30-40 users per floor, the total number of users is between 240 and 320. This subnet size (a /23) efficiently accommodates all users with room for growth, minimizing wasted IP addresses while ensuring sufficient capacity. ip address 192.168.0.0 255.255.0.0 (a /16) provides over 65,000 addresses, which is excessive and wasteful for this scenario. ip address 192.168.0.0 255.255.255.128 (a /25) provides only 126 usable addresses, which is insufficient for 240-320 users. ip address 192.168.0.0 255.255.255.224 (a /27) provides only 30 usable addresses, far too few for even one floor.