Chemistry · Classification of Elements and Periodicity in Properties

Which electronic configuration corresponds to the outermost shell of f-inner transition elements (specifically Lanhanoids and Actinoids)?

1. A
   \( (n-2)f^{0-14} (n-1)d^1 ns^2 \)
2. B
   \( (n-1)f^{1-14} nd^{0-1} ns^2 \)
3. C
   \( nf^{1-14} (n-1)d^{0-1} ns^2 \)
4. D
   \( (n-2)f^{1-14} (n-1)d^{0-1} ns^2 \)