What is the function of a phosphatase?
a phosphatase removes phosphorylated amino acids from proteins.
a phosphatase removes the phosphate group from phosphorylated amino acid residues in a protein.
a phosphatase phosphorylates serine, threonine, and tyrosine residues.
a phosphatase degrades second messengers in the cell.

Option B, A phosphatase removes the phosphate group from phosphorylated amino acid residues in a protein.

Explanation:

A phosphatase enzyme is responsible for removing phosphate group from a protein.

This usually happens during the chemical process of hydrolysis in which phosphomonoester is hydrolysed using phosphatase  as a catalyst..

The final output of this reaction are -

a) Phospahte ion with OH group attached to it

b) H+ ion attaching to the hydroxyl group of the other product.

c) Splitting of water

Option B is correct

not too sure but maybe in the hot springs.