While performing quality control (QC) checks on an open reagent bottle, the technologist notes that no open date/time is written on the bottle. The technologist should address this as a(n):
a. analytical error; the technologist should continue with testing if the QC results are within range.
b. preanalytical error; the technologist should discard the bottle, obtain a new one, and start over.
c. postanalytical error; the QC and patient results are all within normal range, so the technologist should just make a notation in the log.
d. procedural error; the technologist should check the time of the last run on the previous shift, mark the day/time on the bottle, and continue testing.