This is a valid Class C reserved address. For Class C, the reserved addresses are 192.168.0.0 - 192.168.255.255.
The private IP address ranges are defined within RFC 1918:
RFC 1918 private ip address range
The following answers are incorrect:
192.166.42.5 Is incorrect because it is not a Class C reserved address.
192.175.42.5 Is incorrect because it is not a Class C reserved address.
192.1.42.5 Is incorrect because it is not a Class C reserved address.
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