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Consider the following elements. Group A' B' → Period C' D' Which of the following is/are true about A', B', C' and D' ? A. Order of atomic radii: B' < A' < D' < C' B. Order of metallic character: B' < A' < D' < C' C. Size of the element: D' < C' < B' < A' D. Order of ionic radii : B' + < A' + < D' + < C' + Choose the correct answer from the option given below:

1. A only
2. A and B only
3. B, C and D only
4. A, B and D only

Correct answer: A, B and D only

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