The correct answer is C. OR.
An OR gate is a digital logic gate that implements logical disjunction (inclusive OR), that is, it outputs a true (1) output if either or both of its inputs are true.
A NOT gate is a digital logic gate that inverts its input. It takes one input and produces an output that is the logical negation of the input.
A NAND gate is a digital logic gate that implements logical negation followed by logical AND. It takes two inputs and produces an output that is true only if both inputs are false.
A NOR gate is a digital logic gate that implements logical negation followed by logical OR. It takes two inputs and produces an output that is true only if both inputs are false.
E. None of the above is not the correct answer because OR gates send on a pulse when they receive one at either or both of their terminals.