Which of the following is incorrect value provided to "rel" attribute of Anchor

Which of the following is incorrect value provided to "rel" attribute of Anchor Tag ?

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1) Default Style and Color of Unvisited Link in any browser is ____________.

2) Default attribute value of "target" is ______________ in HTML.

3) Relationship Between the Current document and the Linked document is specified using ___________ attribute.

4) Link in HTML can be of following type(s).

5) <a>