Oh and re your FM question....
I would guess c).
If you AM modulate 10MHz with 10kHz you get two side bands 10kHz either side of the carrier (as mentioned above). If you FM modulate the same signals you get an infinte (in theory) number of side bands spaced 10kHz apart either side of the carrier.
So it's the same as AM but....(they go on for ever)
And I've just done it using an RF signal generator and a spectrum analyser to prove it to myself.