Please produce an ER diagram that best represents the relational schema below.

CREATE TABLE TA $($

EMPID INTEGER PRIMARY KEY,

NAME VARCHAR$(60),$

ADDR VARCHAR$(120),$

PHONE CHAR$(10),$

DOB DATE,

SENIORITY DATE NOT NULL

$)$;

CREATE TABLE COURSE$\_$COORDINATOR $($

EMPID INTEGER PRIMARY KEY,

FOREIGN KEY $($EMPID$)$ REFERENCES TA$($EMPID$)$ ON DELETE CASCADE,

EMAIL CHAR$(20)$ NOT NULL,

FIRST$\_$TUTORIAL DATE NOT NULL

$)$;

CREATE TABLE LAB$\_$LEADER $($

EMPID INTEGER PRIMARY KEY,

FOREIGN KEY $($EMPID$)$ REFERENCES TA$($EMPID$)$ ON DELETE CASCADE,

HELP$\_$DESK CHAR$(1),$

COURSE INTEGER,

FOREIGN KEY $($COURSE$)$ REFERENCES COURSE$($COURSEID$)$

$)$;

CREATE TABLE COURSE $($

COURSEID INTEGER PRIMARY KEY,

SHORTNAME CHAR$(40),$

FULLNAME CHAR$(60),$

COURSE$\_$COORDINATOR INTEGER NOT NULL,

UNIQUE$($COURSE$\_$COORDINATOR$),$

FOREIGN KEY $($COURSE$\_$COORDINATOR$)$ REFERENCES COURSE$\_$COORDINATOR$($EMPID$)$

$)$;

CREATE TABLE TUTOR $($

EMPID INTEGER,

FOREIGN KEY $($EMPID$)$ REFERENCES TA$($EMPID$),$

COURSE INTEGER,

FOREIGN KEY $($COURSE$)$ REFERENCES COURSE$($COURSEEID$),$

PRIMARY KEY $($EMPID$,$ COURSE$)$

$)$;