Sum of the pair of electrons on central atom of following species:
${\mathrm{BF}}_3, {\mathrm{CF}}_4, {\mathrm{SiF}}_4$

Correct dipole moment order is

Arrange the following compounds in decreasing order of their dipole moment

${\mathrm{CH}}_3-\underset{\mathrm{I}}{{\mathrm{CH}}_2}-{\mathrm{NO}}_2$, ${\mathrm{CH}}_3-\underset{\mathrm{II}}{{\mathrm{CH}}_2}-{\mathrm{NH}}_2$, ${\mathrm{CH}}_3-\underset{\mathrm{III}}{{\mathrm{CH}}_2}-\mathrm{F}$, ${\mathrm{CH}}_3-\underset{\mathrm{IV}}{{\mathrm{CH}}_2}-\mathrm{C}\equiv \mathrm{N}$

Which of the compound has zero dipole moment?