Explanation:

In a latch circuit, the output remains in a latched state until an external input signal changes its state. Latches can be constructed using different combinations of logic gates, such as NOR gates and NAND gates.

NOR Latch:
A NOR latch consists of two cross-coupled NOR gates. The output of one gate is connected to the input of the other gate, creating a feedback loop. The latch can be in one of two stable states: SET or RESET.

NAND Latch:
A NAND latch consists of two cross-coupled NAND gates. The output of one gate is connected to the input of the other gate, creating a feedback loop. The latch can also be in one of two stable states: SET or RESET, similar to the NOR latch.

Cross Coupling:
The term "cross coupling" refers to the feedback connection between the gates in a latch circuit. In both NOR and NAND latch configurations, the output of one gate is connected to the input of the other gate. This cross coupling is what allows the latch to maintain its state.

Latched Condition:
When a latch is in a latched condition, it means that it is holding its current state. In other words, the output is not changing even if there are changes in the input signals. The latch remains in the latched condition until an external input signal causes it to change its state.

Why Cross Coupling Enables Latched Condition:
The cross coupling in NOR and NAND latch configurations plays a crucial role in enabling the latched condition. When the latch is in a stable state, the feedback loop ensures that the output signal reinforces itself. This reinforcement occurs through the feedback connection, where the output is fed back into the input, strengthening the existing state.

Effect of Cross Coupling on Input Voltages:
The cross coupling feature is not directly related to low input voltages (option A), synchronous operation (option B), or gate impedance (option C). These factors may have an impact on the latch operation but are not the main reason for the latch to remain in a latched condition.

Conclusion:
The configuration feature that enables latches constructed with NOR and NAND gates to remain in the latched condition is the cross coupling between the gates. This feedback connection ensures that the latch holds its state until an external input signal causes a change.