Right answer is (a) mailto:
Explanation: Target attribute is for specifying where to open linked document i.e. in a new tab, same frame, parent frame, full body of the window etc. We use mailto: with <a> and href for specifying the email address that we want to be sent to. It will open a new email message and address to a person specified in the link. The email link will appear like a normal link. The id attribute is for defining bookmarks in a page.