The correct crontab entry to execute the script chklog three times per month between 3 p.m. and 5 p.m.:

The minute field `*` would execute the script every minute, and the hour field `3,4,5` corresponds to 3 AM, 4 AM, and 5 AM, not PM.

The minute field `3` would execute the script at 3 minutes past the hour, and the hour field `3,4,5` corresponds to 3 AM, 4 AM, and 5 AM, not PM.

The minute field `3` would execute the script at 3 minutes past the hour, and the day-of-month field `*` would execute it every day, not just on a specific day of the month.

The minute field `0` ensures execution at the top of the hour, the hour field `15,16,17` specifies 3 PM, 4 PM, and 5 PM respectively, and the day-of-month field `1` ensures these executions occur on the first day of every month. This configuration correctly schedules the script to run three specific times during the specified period on a single day of the month.

The minute field `*` would execute the script every minute during the specified hours, not once at the top of each hour.