ABCD is a quadrilateral in which AD = BC and `angleDAB = angleCBA`. If `DeltaABD ~= DeltaBAC` what is the relation between `angleABD` and `angleBAC` ?

Options

A. `angleABD=1/2 angleBAC`
B. `angleABD=angleBAC`
C. `angleABDgtangleBAC`
D. `angleABDltangleBAC`.