The Only Invalid Electron State and Shell Designation Among the Following

The only invalid electron state and shell designation among the following is

A) $3 d , \mathrm { M } ( n = 3 )$ shell.
B) $3 s , \mathrm { M } ( n = 3 )$ shell.
C) $2 d , \mathrm {~L} ( n = 2 )$ shell.
D) $1 s , \mathrm {~K} ( n = 1 )$ shell.
E) $2 s , L ( n = 2 )$ shell.

Correct Answer:

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