Is the orbital designation 2d theoretically possible why or why not ?

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Explanation: 

No, this designation is not possible because for the d subshell the smallest energy level is 3 . So, d sub shell adds after third shell.So, 2d orbital is not possible.

Answer: 

No, 2d orbital is not possible becasue d subshell is from third principal energy level and in the orbital given here principal energy level is second.