What are the protection factors of the following respirators?
a) Half-face: 10, Full-face: 50, PAPR: 25, SCBA: 100
b) Half-face: 25, Full-face: 50, PAPR: 1000, SCBA: 500
c) Half-face: 5, Full-face: 10, PAPR: 50, SCBA: 1000
d) Half-face: 100, Full-face: 500, PAPR: 100, SCBA: 50