The higher homologue of dimethyl amine has the structure 

$\mathrm{A}.$ ${\left({\mathrm{CH}}_3\right)}_3\mathrm{C}—\mathrm{OH}$

$\mathrm{B}.$ ${\left({\mathrm{CH}}_3\right)}_3\mathrm{C}—{\mathrm{NH}}_2$

Which of the two is the correct statement with respect to the above structures?

Which of the statement is correct regarding the above compound?

Identify the total number of different functional groups in the above compound.

In the above compound, the functional groups present are: