Question: Suppose you received these bit strings over a communications link, where the last bit is a parity check bit. In which string are you sure

Suppose you received these bit strings over a communications link, where the last bit is a parity check bit. In which string are you sure there is an error?
a) 00000111111
b) 10101010101
c) 11111100000
d) 10111101111

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