Question: Which is true regarding the tuple variables in this relational calculus expression? { e . Lname, e . Fname | EMPLOYEE ( e ) AND

Which is true regarding the tuple variables in this relational calculus expression?
{e.Lname, e.Fname | EMPLOYEE(e) AND ((EXISTSp)(EXISTSw)(PROJECT(p) AND WORKS_ON(w) AND p.Dnum=5 AND w.Essn=e.Ssn AND p.Pnumber=w.Pno)}
Group of answer choices
P, W are bound. E is free
P, E are bound. W is free
P is bound. W, E are free
W, E are bound. P is free

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