The magnetic moment, in units of BM, of copper in $$[\text{Cu(H}_2\text{O})_4]^{2+}$$ and $$[\text{Cu(NH}_3)_4]^{2+}$$ respectively is

A

1.73 and 0

B

1.73 and 1.73

C

2.83 and 2.83

D

0 and 2.83