Which set of products will be obtained in the following reactions?
$RCN \xrightarrow{\text{reduction}} (a)$
$RCN \xrightarrow[(ii) H_2O]{(i) CH_3MgBr} (b)$
$RNC \xrightarrow{\text{hydrolysis}} (c)$
$RNH_2 \xrightarrow{HNO_2} (d)$

• A
  $1^o$ amine,methyl ketone,$1^o$ amine,alcohol
• B
  $1^o$ amine,methyl ketone,$1^o$ amine,alcohol
• C
  $2^o$ amine,methyl ketone,$2^o$ amine,acid
• D
  $2^o$ amine,methyl ketone,$2^o$ amine,aldehyde