Which statement about self$-$regulation by media is true?

Multiple Choice

Of all the commencials submined for review, about $3$ percent are rejectied.

Most commercials once rejected cannot be resubmithed.

Network standards have become more stringent in response to compertion from independent and cable stations.

Network standards regarding acceptable advertising have remained constant over the past $30$ to $40$ years.

Advertising for contraceptives is complenely banned on all netagis since thas.