An IPv4 address consists of 32 bits broken into four 8-bit segments (octets). Each octet is converted to decimal and the four values are written in dotted-decimal notation (for example, 192.168.1.1). The other choices are incorrect because 48-bit addresses describe MAC addresses, 64-bit binary strings are not used for IP addressing, and 128-bit hexadecimal groups separated by colons describe IPv6, not IPv4.
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