Converting MOV to MP4

Hi forum,

I'm using AME CS6 and would like to convert a MOV file to MP4. My format options are F4V, FLV, H.264, H.264 (legacy), and MP3. I tried to export using H.264 and ended up with a 3GP file. Is it possible to export a MP4 file using one of my 5 format options? Or are there additional steps that I'll need to take? If so, what are they?

Thanks for your help!