Which one of the following logic elements describes a circuit with two normally open input switches in series?

A circuit with two normally open input switches in series represents an AND logic element. This configuration requires both switches to be closed (activated) in order to complete the circuit and produce a high output. This aligns perfectly with the functionality of an AND gate, which outputs a true value only when all its inputs are true.

When both switches are open (inactive), the circuit remains incomplete, resulting in a low output. Therefore, for the output to be high, both inputs (the switches) must be engaged. This property of needing all inputs to be active is fundamental to the AND operation, differentiating it from other logic elements that may require fewer conditions for a true output.