Cross linked silicone polymer are given by the hydrolysis of which of the following substituted silanes ?

• A

  ${\mathrm{R}}_4\mathrm{Si}$

• B

  ${\mathrm{R}}_2{\mathrm{SiCl}}_2$

• C

  ${\mathrm{RSiCl}}_3$

• D

  ${\mathrm{R}}_3\mathrm{SiCl}$