Answer:A zero-day vulnerability is a vulnerability in a system or device that has been disclosed but is not yet patched. An exploit that attacks a zero-day vulnerability is called a zero-day exploit.
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Answer:
I think its 2, but correct me if i'm wrong. :>
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Answer: Style inheritance
Explanation:
Style inheritance is used to design style sheets. It is a process in which properties are inherited by children from a parent element. For example you wish that all text on a page use same font color i.e. red. You can apply they following style for <body> tag like {body color:red;}. All the elements in the web page will inherit this font color. This is better to use than to create styles for each tag. Every heading and paragraph will be displayed in this font color until you define different color for particular element.
