A 78 year old male was admitted to a local hospital with complaints of hip pain, abdominal pain, and fatigue. Initial workup was unrevealing, but the patient was admitted due to concerns for safe ambulation. His stay was relatively uneventful as he underwent laboratory and radiological Success Failure Treatment A 30 10 Treatment B 62 18 tests as well as physical therapy sessions. On hospital day 3, he was noted to be febrile to 100.6F. A rapid COVID-19 test was found to be positive. As it was unclear when his initial onset of symptoms began, contact tracing was performed for his entire hospital stay. Infection control collected the following information: 250 total staff met criteria of being exposed for >15 minutes, with 195 of them stating they wore N95 respirators, and 55 of them wearing surgical mask. Screening testing was undertaken at day 7 after exposure resulting in 12 staff positives among those wearing surgical masks and 10 staff positives among those wearing N95 respirators. What was the relative risk of testing COVID-19 positive for those staff who wore a surgical mask versus those who wore an N95 respirator?

a. 3.098

b. 5.16

c. 1.2

d. 4.275

e. 14.23