An enzyme catalyzes the following irreversible $($forward$-$only$)$ reaction. What is the top$-$level classification of this enzyme?

$600042$

c$00044$

a$.$ EC $1.$X$.$X$.$X oxidoreductase

b$.$ EC $2.$x$.$x$.$x transferase

c$.$ EC $3.$X$.$x$.$X hydrolyase

d$.$ EC $4.$x$.$x$.$x lyase

e$.$ EC $5.$X$.$X$.$X isomerase

f$.$ EC $6.$x$.$x$.$x ligase