Use the following create statement:

create table emp $($

eno int,

pid int,

name char$(50),$

mgrNo int,

xyz char$(3)$ references dept$($dno$),$

unique $($pid$,$ name, mgrNo$),$

primary key $($eno$,$ xyz$,$ pid$),$

foreign key mgrNo references emp $($eno$))$

How many keys are there in table emp?

a$.1$

b$.2$

C$.3$Use the following create statement:

create table emp $($

eno int,

pid int,

name char$(50),$

mgrNo int,

xyz char$(3)$ references dept$($dno$),$

unique $($pid$,$ name, mgrNo$),$

primary key $($eno$,$ xyz$,$ pid$),$

foreign key mgrNo references emp $($eno$))$

How many keys are there in table emp?

a$.1$

b$.2$

c$.3$

d$.4$