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ISRO2007-73

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class D(224.0.0.0-239.255.255.255) reserved for multicast  so ans should be C
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Class D addresses are 32-bit network addresses, meaning that all the values within the range of 224.0.0.0 – 239.255.255.255 are used to uniquely identify multicastgroups. There are no host addresses within the Class D address space, since all the hosts within a group share the group's IP address for receiver purposes

https://www.paessler.com/info/ip_address_basics_ii

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Octet 224 corresponds to 1110 which corresponds to Class D which is used for Multicast netwroking.

Option C

Bonus: Octet 1111 corresponds to Class E which is reserved for experimental purposes.

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