Given below are four logic gates symbol (figure). Those for OR, NOR and NAND are respectively

Options

A. (d), (c), (a)
B. (b), (c), (a)
C. (a), (b), (c)
D. (a), (c), (d)

Answer

To identify the symbols for the OR, NOR, and NAND gates, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the OR Gate:**
- The OR gate symbol typically has a curved shape on the input side and a straight line on the output side.
- It takes two inputs, A and B, and produces an output that is the logical disjunction of A and B.
- The output can be expressed as:
\[ \text{Output} = A \text{ OR } B \]
- **Conclusion:** The symbol for the OR gate is represented as option **A**.

2. **Identify the NOR Gate:**
- The NOR gate is essentially an OR gate followed by a NOT gate.
- To represent this, we can take the output of the OR gate and apply a NOT operation to it.
- The output of the NOR gate can be expressed as:
\[ \text{Output} = \overline{A \text{ OR } B} \]
- **Conclusion:** The symbol for the NOR gate is represented as option **C**.

3. **Identify the NAND Gate:**
- The NAND gate is an AND gate followed by a NOT gate.
- The AND gate symbol has a similar shape to the OR gate but is more pointed on the input side.
- The output of the NAND gate can be expressed as:
\[ \text{Output} = \overline{A \text{ AND } B} \]
- **Conclusion:** The symbol for the NAND gate is represented as option **B**.

4. **Final Arrangement:**
- Based on the identifications:
- OR gate: Option A
- NOR gate: Option C
- NAND gate: Option B
- Therefore, the correct order of the gates is: **A (OR), C (NOR), B (NAND)**.

### Final Answer:
The symbols for the OR, NOR, and NAND gates are respectively: **A, C, and B**.

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