Translate the above E$/$R diagram to relations using the "Object$-$oriented" approach, the $"$E$/$R$"$

approach, and the "NULLS" approach. Then, identify which of the following sets of attributes is

the schema for some relation in the $"$E$/$R$"$ approach, but does not appear if we use either the

"object$-$oriented" approach or the "NULL's" approach.

$C(d,e,g)$

$B(d,e,f)$

$B(d,f)$

$A(d,e,f,g)$