Which logic element describes two or more normally closed input switches in parallel?

The logic element that describes two or more normally closed input switches in parallel is a NAND gate. In a normally closed configuration, the switches allow current to pass through when they are open; when they are closed, the circuit is interrupted.

When considering a NAND gate, it produces a low output only when all of its inputs are high (representing closed switches in this context). Hence, if all parallel switches are closed, the circuit is interrupted, resulting in a high signal; if any are open, the output remains low. This is consistent with the behavior of a parallel configuration of normally closed switches, where the condition of at least one switch opening (being open) causes the overall output to be low.

In summary, a parallel arrangement of normally closed switches behaves like a NAND gate, producing a high output unless all switches are closed. This understanding of how the circuit operates leads to identifying the correct logic element in this scenario.