Pick one A, B or C. Provide a reason for A or B or C, if you like, but pick from A or B or C.
Id go for answer B.
I wouldnt
exceed VMO/MMO

but stay close to it until the change over to 275 kts and while approaching to FL 270 adjust pitch towards 300 kts while keeping an eye on N2 to get about 11%.
In any case starting the APU should not be delayed.
If no luck on a windmill restart and a starter assist is the only way, then start to pitch for a speed equal to 100kts above vref40 if above FL270 and a speed equal to vref40+80 kts when below fl 200.
500ft/NM i believe is the NG glide.