If n and `l` are respectively the principal and azimuthal quantum numbers , then the expression for calculating the total number of electrons in any energy level is :
A
`underset(l=0)overset(l=n)sum2(2l+1)`
B
`underset(l=1)overset(l=n)sum2(2l+1)`
C
`underset(l=0)overset(l=n)sum2(2l+1)`
D
`underset(l=0)overset(l=n-1)sum2(2l+1)`
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