What is the formal charge on ' $\mathrm{N}$ ' atom in $\mathrm{NH}_4^{+}$ion?

What is the formal charge on ' $\mathrm{N}$ ' atom in $\mathrm{NH}_4^{+}$ion?
  1. $+1$
  2. $-3$
  3. $-1$
  4. zero

Asked in: MHT CET 2021 (23 Sep Shift 2)

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