MBR/Boot in RAID

Which drive in a RAID stripe contains the MBR?

The first drive.

Bonus:

Which drive in a RAID stripe contains the boot sector?

On a hardware RAID, no specific location.
On a software RAID, the first drive.

RAID5:
In RAID5, if there are mostly zeros at the start of the volume, the parity block may contain an exact duplicate of the MBR/boot sector.

For other parameters, check RAID 0 Recovery primer.

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