Refer to the exhibit. With an IPSec tunnel established between remote Router A and head-end router B, with Compressed Real-Time Protocol (cRTP) configured on the serial interface of Router A, what impact will the cRTP configuration have on the Voice over IP packets flowing through the IPSec tunnel from a Cisco 7960 IP phone?（）

• A、Twenty bytes of header will be replaced with five bytes. 
• B、If the IPSec transform set includes Authentication Header, the receiving IPSec peer will discard the packets. 
• C、The IPSec packets will be dropped by Router A's compression logic.
• D、The voice packets will not be compressed.