Comprehensive Technical Explanation:

An IPv4 address consists of 32 bits divided into four 8-bit octets expressed in dotted-decimal notation (x.x.x.x), where each octet is an integer ranging strictly from 0 to 255. In Classless Inter-Domain Routing (CIDR) notation, this is followed by a slash and a prefix length representing the subnet mask bit length. Examining the provided options reveals that options A, B, C, and D contain invalid characters, typographical syntax errors, missing periods, or malformed subnets (e.g., letters 'G' and 'Q', dashes, or improper separators). Option E (10.10.10.255/24) conforms strictly to RFC-compliant IPv4 formatting and valid CIDR notation. Note that while 10.10.10.255 functions specifically as the directed broadcast address for the /24 network segment (and not an assignable individual host IP address), it represents the valid network-layer broadcast address within a standard IPv4 scheme. In Fireware Policy Manager and Web UI configurations, alias entries and interface definitions strictly validate dotted-decimal entries against this 32-bit mathematical format, immediately rejecting entries with non-numeric strings or invalid delimiters.