The inside user subnet is 192.168.1.0/24, which supports 254 usable host addresses. The configured NAT pool only provides addresses from 10.10.10.1 through 10.10.10.100, giving 100 usable translated addresses. Dynamic NAT without overload requires a sufficient number of inside global addresses if all users must be translated at the same time. Therefore, to support all users continuously, the NAT pool must be increased to support the 254 usable inside hosts. Option C is the best answer. Option A, match-host, is not the correct fix for the pool-size shortage; it is used for host-number matching behavior and still requires a usable pool design. Option B is wrong because NAT should translate private inside addresses to a different inside global address range, not reuse the same inside local subnet. Option D describes static one-to-one behavior and does not match the dynamic NAT route-map configuration shown. The key technical issue is address pool capacity. References/topics: ENCOR Infrastructure, NAT, dynamic NAT, inside local and inside global addresses, NAT pools, route-map-based NAT.