The correct crontab entry to execute the script chklog three times per month between 3 p.m. and 5 p.m.:
A. * 3,4,5 1 * * chklog
B. 3 3,4,5 1 * * chklog
C. 3 15,16,17 * * * chklog
D. 0 15,16,17 1 * * chklog
E. * 15,16,17 1 * * chklog
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Very ambiguous answer. The contrab described (0 15,16,17 1 * *) is translated as “At 03:00 PM, 04:00 PM and 05:00 PM, on day 1 of the month”. So in absolute number, the script is executed 3 times during a month.