$1.$ The $\{$GRADUATE$\_$STUDENT, UNDERGRADUATE$\_$STUDENT$\}$ is a $\_\_\_\_\_\_\_\_\_\_\_\_\_$ specialization of STUDENT.

a$)$ disjoint, partital

b$)$disjoint$,$ total

c$)$ overlapping, total

d$)$ overlapping, partial

$2.$ The $\{$EMPLOYEE$,$ ALUMNUS, STUDENT$\}$ is a $\_\_\_\_\_\_\_\_\_\_\_\_\_$ specialization of PERSON.

a$)$ disjoint, partital

b$)$disjoint$,$ total

c$)$ overlapping, total

d$)$ overlapping, partial

$3.$ The $\{$STAFF$,$ FACULTY, STUDENT$-$ASSISTANT$\}$ is a $\_\_\_\_\_\_\_\_\_\_\_\_\_$ specialization of EMPLOYEE.

a$)$ disjoint, partital

b$)$disjoint$,$ total

c$)$ overlapping, total

d$)$ overlapping, partial

$4.$ GRADUATE$\_$STUDENT inherits $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$from STUDENT

a$)$ Major$\_$dept

b$)$Degree$\_$program

c$)$Class

d$)$ All of above

$\_\_\_\_\_\_\_\_$ is a shared subclass by EMPLOYEE and STUDENT.?