"Why couldn't antivirus scanners detect the exploitation of Heartbleed?
(A) This is a meaningless question: Heartbleed can only read out-of-bounds content, so there is no possible exploitation.
(B) Antivirus scanners often look for viruses and other malicious software.
(C) The Heartbleed attack targets antivirus scanners themselves.
(D) Antivirus scanners typically look for viruses and other malicious code, but Heartbleed exploitation can steal secrets without injecting any code." Respond with at most 1000 words.
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