The statement that is true for a zero-day attack is a zero-day attack is impossible to detect as it exploits the unknown vulnerabilities.
What is zero-day attack?
Zero-day is a computer software vulnerability. Zero-day attack is a situation in which the hacker finds the vulnerability of the software before the developer fix it.
Thus, the correct option is B, A zero-day attack is impossible to detect as it exploits the unknown vulnerabilities.
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