An IP address uniquely identifies a device on an IP-based network and allows data packets to be routed correctly. It contains information that helps determine the network and host portions of the address. Both IPv4 and IPv6 formats serve this purpose. Hence the numeric label described in the stem is an IP address.
Option A:
Option A, access server, refers to a machine that provides connectivity or services to clients but is not a numeric label. It can possess an IP address but is a physical or virtual device rather than the address itself.
Option B:
Option B is correct because IP addresses are defined in networking standards precisely as numerical identifiers for interfaces or hosts. Without them, communication using the Internet Protocol cannot be properly directed.
Option C:
Option C, domain alias, relates to human-readable names managed by DNS and may map to IP addresses, but the alias itself is not the numeric label assigned by the protocol.
Option D:
Option D, internet service, is a broad term for facilities provided by an ISP or application and does not denote an addressing scheme.
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