A tetrahedron has vertices $O(0,0,0),A(1,2,1),B(2,1,3),andC(−1,1,2),$then angle between face $OABandABC$will bea. $cos_{−1}(3117 )$ b. $30_{0}$ c. $90_{0}$ d. $cos_{−1}(3519 )$

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