$S(t)=12cos2000{10}^{4}t+2cos2400{10}^{4}t+2cos2800{10}^{4}t$

The ratio of information to the power of the carrier is:

Select one:

a$.0\mathrm{.}5$

b$.0\mathrm{.}09$

c$.4$

d$.0\mathrm{.}25$