Bitwise operators work at the binary level, operating directly on bits of integers.
Common bitwise operators include:
- | (Bitwise OR)
- \^ (Bitwise XOR)
- & (Bitwise AND)
- << (Left shift) and >> (Right shift)
The . operator, however, is not a bitwise operator — in many programming languages it is used as a member access or concatenation operator (e.g., accessing object properties or joining strings).
Thus, $\mathbf.$ is the correct answer.