Explanation:

Arithmetic logic gates are the fundamental building blocks of digital circuits that perform arithmetic and logical operations. They are used to manipulate binary numbers and perform operations such as addition, subtraction, multiplication, division, and logical operations like AND, OR, NOT, etc.

XOR Gate:
XOR gate stands for Exclusive OR gate. It has two or more inputs and one output. The output of an XOR gate is true (1) only when the number of true inputs is odd. The XOR gate implements the exclusive OR operation, which returns true (1) only when the inputs are different.

XNOR Gate:
XNOR gate stands for Exclusive NOR gate. It is a combination of XOR and NOT gates. It has two or more inputs and one output. The output of an XNOR gate is true (1) only when the number of true inputs is even. The XNOR gate implements the exclusive NOR operation, which returns true (1) only when the inputs are the same.

Both XOR and XNOR Gates:
Both XOR and XNOR gates are arithmetic logic gates. They are used to perform logical operations and are essential components in digital circuits. XOR gate is used for addition, subtraction, and comparison operations, while the XNOR gate is used for equality comparison and complementing operations.

Conclusion:
Based on the above explanation, it is clear that both XOR and XNOR gates are arithmetic logic gates. Therefore, the correct answer is option 'C' - Both.