Which of the following symbols represents a universal gate

Options

A.
B.
C.
D.

Explanation

To determine which symbol represents a universal gate, we need to understand what a universal gate is and identify the options provided.

### Step-by-Step Solution:

1. **Definition of Universal Gate**:
- A universal gate is a type of logic gate that can be used to create any other type of logic gate. The two most common universal gates are the NAND gate and the NOR gate.

2. **Identifying the Options**:
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