Which type of logic element uses a control relay?

The use of a control relay is significantly associated with memory elements in logic circuits. Memory logic elements are designed to store binary information, and they often require a control mechanism to retain or update this information. Control relays serve as electrical switches that can maintain a particular state in a circuit based on the control signals they receive, making them crucial in memory designs.

In contrast, NAND, NOR, and NOT gates are basic combinational logic elements whose functions depend solely on their inputs at any given time. They do not inherently retain state information or require a control relay to operate; their outputs change in real-time based on the current inputs rather than maintaining a stable state. Thus, the use of a control relay is fundamentally linked to memory logic elements, as they need additional circuitry to manage the storage and retrieval of data, which the control relay facilitates.