Which of the following logic describes the EXOR gate?

• A. y <= ((not a) OR (not b)) AND ((not a) OR (not b));
• B. y <= ((not a) OR b) AND (a OR (not b))
• C. y <= ((not a) AND (not b)) OR ((not a) AND (not b));
• D. y <= ((not a) AND b) OR (a AND (not b));