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Consider the following statements regarding the logic circuits:

1. In combinational logic circuits, the outputs at any instant of time are entirely dependent upon the inputs present at that time.

2. The behavior of synchronous sequential circuit depends upon the order in which its input signals change and can be affected at any instant of time.

3. Synchronous sequential circuits that use clock pulses in the inputs of memory elements are called clocked sequential circuits.

Which of the above statements are correct?

(a) 1, 2 and 3

(b) 1 and 2 only

(c) 2 and 3 only

(d) 1 and 3 only
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Option D is the correct answer because 

The behavior of asynchronous sequential circuit depends upon the order in which its input signals change and can be affected at any instant of time.

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