The output of `OR` gate is `1`

Options

A. If either or both inputs are 1
B. Only if both inputs are 1
C. If either input is zero
D. If both inputs are zero

Explanation

To solve the question regarding the output of an OR gate being 1, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the OR Gate Functionality**:
- An OR gate is a digital logic gate that outputs true or 1 when at least one of its inputs is true or 1.

2. **Define Inputs and Output**:
- Let the inputs be A and B.
- The output will be denoted as C.

3. **Write the Logical Expression**:
- The output C can be expressed as:
\[ C = A + B \]
- Here, "+" denotes the logical OR operation.

4. **Construct the Truth Table**:
- Create a truth table to show all possible combinations of inputs A and B and their corresponding output C.

| A | B | C (A + B) |
|---|---|-----------|
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 1 |

5. **Analyze the Truth Table**:
- From the truth table, we see that the output C is 1 in the following cases:
- When A = 0 and B = 1
- When A = 1 and B = 0
- When A = 1 and B = 1

6. **Conclusion**:
- The output of the OR gate is 1 if either A or B (or both) is 1.

### Final Answer:
- The output of the OR gate is 1 if either or both inputs are 1.