P = {x | x is an odd natural number, 1< x ≤ 5}. How to write this set in roster form?

(A) {1, 3, 5} 

(B) {1, 2, 3, 4, 5}

(C) {1, 3} 

(D) {3, 5}

In A⁺ B^– ionic compound, radii of A⁺ and B^– ions are 180 pm and 187 pm respectively. The crystal structure of this compound will be……….

(A) NaCl type

(B) CsCl type

(C) ZnS type

(D) B₂O₃ type