$1)$ Assume that vec$1$ is an existing integer vector. Each of the following statements$$attempts to create a new integer vector, vec$2.$ Indicate whether each of these$$statements is legal or illegal.

B$)$vector$$vec$2(10)$;$$ legal

C$)$vector$$vec$2(10,100)$;$$ legal

D$)$vector$$vec$2($vec$1)$;

E$)$vector$$vec$2($vec$1.$size$())$;