What does the acronym CTAF stand for, and which frequency may it be?

Why: The FAA study guide states: "The acronym CTAF, which stands for Common Traffic Advisory Frequency, is synonymous with this program. A CTAF is a frequency designated for the purpose of carrying out airport advisory practices while operating to or from an airport without an operating control tower. The CTAF may be a UNICOM, MULTICOM, FSS, or tower frequency and is identified in appropriate aeronautical publications."

• Gives the wrong expansion and wrongly restricts CTAF to towered airports only; CTAF exists specifically for operations at airports without an operating control tower.
• Invents a nonexistent "Certified Traffic Avoidance Frequency"; no such FAA-reserved frequency exists in the source material.