CIDR Notation is correct because it expresses an IP address together with its network prefix in a single compact form such as 192.0.2.0/24.

CIDR Notation uses a slash followed by a prefix length to indicate how many leading bits form the network portion. This representation combines the address and the mask into one string which makes it concise and unambiguous for both IPv4 and IPv6 networks.

Hexadecimal Notation is incorrect because hexadecimal is merely a base 16 representation of values and it does not by itself combine an IP address with a network prefix in the standard routing or addressing formats.

Subnet Mask Decimal Notation is incorrect because that style shows the subnet mask separately in dotted decimal form such as 255.255.255.0 and it does not present the address and prefix together in a single compact token.

Dotted Decimal Notation is incorrect because dotted decimal refers to the usual IPv4 address format like 192.0.2.1 and it does not include the prefix length so it does not meet the requirement of expressing the address and network prefix in one compact form.

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