Which letter corresponds to 'X' in the phonetic alphabet?

In the phonetic alphabet, 'X' corresponds to 'X-ray.' This system is utilized primarily in law enforcement and military communications to ensure clear and unambiguous transmission of letters over radio or telephone communications where distortion or misunderstanding can occur.

'X-ray' is widely recognized in this context and is effective in avoiding confusion, as it is descriptive and easily understood. The other options may represent words starting with 'X,' but they are not part of the standardized phonetic alphabet used for communication purposes. This specific association helps maintain clarity in high-stakes situations where accurate communication is critical.