If the electronic configuration of an element is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s² , the four electrons involved in chemical bond formation will be .
(a) 3p⁶
(b 3p⁶, 4s²          
(c)  3p⁶, 3d²         
(d) 3d¹,4s²

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