Wave Talkers Amateur Extra Exam Prep: E1 Questions

E1A04:

With your transceiver displaying the carrier frequency of phone signals, you hear a DX station calling CQ on 3.601 MHz LSB. Is it legal to return the call using lower sideband on the same frequency?

Yes, because the DX station initiated the contact
Yes, because the displayed frequency is within the 75 meter phone band segment
No, the sideband will extend beyond the edge of the phone band segment
No, U.S. stations are not permitted to use phone emissions below 3.610 MHz