After an exposure incident, according to the bloodborne pathogens standard, an employer must keep a log that includes

location of the incident (where in the office it happened).
what type of follow-up care was taken after the incident.
description of how the incident occurred.
all of the above.

all of the above.

Rationale: all of the above – Location of the incident, description of how it happened, and what type of follow-up care was taken are all steps taken after an exposure incident.