Final answer:
When the enable line of a Gated D latch is low, the latch maintains its output at the last value it had, ignoring any changes on the data input.
Step-by-step explanation:
When discussing the behavior of a Gated D latch in digital electronics, the enable (or control) line is crucial for determining the state of the latch. If the enable line is low, it means that the latch is in a state where it does not respond to changes on the data input (D). The output of the latch will hold the last value it had before the enable line went low. This characteristic makes the Gated D latch a level-sensitive device, as it only captures and holds the input when the enable line is high, allowing it to serve as a basic memory element in electronic circuits.