Answer:
if the input is zero the out put is 1
Explanation:
because if you think about it if the input was 1 the output would be zero
I suggest you to read OpenSSL changelogs to make it more clear. As there's not enough space to describe how it works. But heartbleed resistan version was 1.0.2, as I know.
B.temperatute and pH can affect how enzymes work