When fluoride reacts with the metal it forms an f negative ion the fluorine adam has gained an electron an undergone

Reduction.

Explanation:

Fluorine atom has gained an electron and undergone reduction because when an atom gains electron it reduced itself thus acting as an oxidant to oxidize another atom .

   For exam sodium fluoride  NaF is a salt when sodium fluoride undergo breakdown at that time the fluoride atom gains an electron and is converted to F- anion by the process called reduction .

its first and third is your answer i did the qustion the fourth isnt right