With Regard to the National Do Not Call List Registry

With regard to the National Do Not Call List registry (National DNCL) ,which of the following statements is true?

A) The registry enables consumers to reduce the number of unsolicited bulk email they receive by making a single registration.
B) The registry requires consumers to register only once to avoid all future unsolicited phone calls.
C) The registry enables consumers to reduce the number of unsolicited phone calls they receive by making a single registration.
D) The registry enables consumers to reduce the number of unsolicited internet pop-up ads they receive by making a single registration.
E) The registry requires telemarketers to operate and maintain the national DNCL.