When $Mn{O}_{2}$ is fused with KOH, a coloured compound is formed, the product and its colour is [IIT Screening 2003]

(1) ${K}_{2}Mn{O}_{4}$, purple green

(2) $KMn{O}_{4}$, purple

(3) $M{n}_{2}{O}_{3}$, brown

(4) $M{n}_{3}{O}_{4}$ black