Which answer correctly completes the following statement? The characteristics of an MLS installation are that it uses:
an azimuth transmitter at the approach end of the runway, an elevation transmitter at the upwind end of the runway and two frequencies.
one transmitter for both elevation and azimuth and two frequencies.
one transmitter for both elevation and azimuth and a single frequency.
an elevation transmitter at the approach end of the runway, an azimuth transmitter at the upwind end of the runway and a single frequency.