Consider an Employees relation/table instance with the following request: ?(ID PostDoc ? alang $50) AND dept Chem" Employees what is the output? n Employees Rank Faculty Post doc Faculty ID Last nameDept 10 12 18 43 28 32 25 37 48 50 53 48 58 Salarv 95 50 105 David Carlos Edward Frank JonesPhysicsFaculty LopezPh Ellen James Smith Rogers Evans Mary Diaz ?? CS CS Chem Post doc 82 25 80 40 108 45 ysicsGrad St ChemFaculty BioPost dooc Facult Chem Post Doc Bio Faculty ChemGrad St Grad St CS 25 O a) Two tuples: [ID: 37, Rank- "Post DocID: 50, Rank- "Post Doc ?b) Two tuples: {ID: 48, Rank. "Grad St'Ih ID: 50, Rank-"Post Doc") c) One tuple: {ID: 50, Rank= "Post Doc"} O d) Null, no valid output