Question : If a : b = c : d, then which of the following ratios is equal to a : c?

Option 1: a : d

Option 2: b : c

Option 3: a + d : b + c

Option 4: a + b : c + d

Question : Directions: C @ D means C is the father of D;
C * D means C is the brother of D;
C × D means D is the husband of C;
C # D means C is the sister of D;
C + D means C is the son-in-law of D;
C = D means C is the mother of D.
How is A related to C in the following expression?
A @ L # F * E × G + C

Option 1: Husband

Option 2: Son

Option 3: Brother

Option 4: Father