Which regular expression is needed to capture the IP address 192.168.20.232?

Which regular expression is needed to capture the IP address 192.168.20.232?
A . ^ (?:[0-9]{1,3}.){3}[0-9]{1,3}
B . ^ (?:[0-9]f1,3}.){1,4}
C . ^ (?:[0-9]{1,3}.)’
D . ^ ([0-9]-{3})

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Answer: A