Why An inverting linear transponder works by mixing the whole uplink passband with a local oscillator so that the output spectrum comes out backwards. That means a signal near the low edge of the uplink passband appears near the high edge of the downlink passband, and the sideband sense flips, so a USB uplink is heard as LSB on the downlink (which is why operators use LSB uplink on Mode B linear birds to get USB down). Because the spectrum is reversed, a Doppler shift upward on the uplink translates into a shift downward on the downlink, so the two partially cancel and the net drift you must chase is smaller. All three statements describe the same inversion process, so the combined choice is correct.
Watch out Each individual statement is true on its own, so picking just the sideband reversal or just the band reversal misses that inversion causes all of these effects at once; this is a classic pool question where the separate facts are all consequences of one mechanism.
Inverting transponder flips everything: band position, sideband, and Doppler direction.