Which of the following is a common use of the dual-VFO feature on a transceiver?

A Variable Frequency Oscillator (VFO) is used to tune the radio to a specific frequency. Having a dual-VFO feature allows a transceiver to store and quickly switch between two independent frequencies. The most common use of dual-VFOs is split frequency operation, particularly during DX (long-distance) pileups or when working stations that are transmitting and receiving on different frequencies. One VFO is set to the receive frequency, and the other is set to the transmit frequency. It is important not to confuse dual-VFO operation with full-duplex operation or transmitting on two frequencies at once. Dual-VFO still typically relies on a single transmitter and receiver chain, rapidly toggling the frequency between the transmit and receive cycles.