A bite of wisdom

What word refers to a person who acts as support or defense?

Ballpark

Smirk

Berserk

Bulwark

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bulwark

1. a defensive wall.

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Choice "A": Ballpark % of users selected this choice.
Choice "B": Smirk % of users selected this choice.
Choice "C": Berserk % of users selected this choice.
Choice "D": Bulwark % of users selected this choice.