Pick out the correct statement.

• A
  $SiC$ is a covalent carbide; on hydrolysis,it gives $Si(OH)_4$ and $CH_4$.
• B
  $Al_4C_3$ is an ionic carbide; on hydrolysis,it gives $CH_4$.
• C
  $Be_2C$ is an ionic carbide; on hydrolysis,it gives methane gas.
• D
  $B$ and $C$ both.