Once a job has been secured, which of the following activities should be avoided?

A) Keeping a finger on the pulse of the job market
B) Updating a résumé only when applying for a new job
C) Keeping up on one's professional reading
D) Assessing and acquiring different skills required for the job
E) Staying alert to better job opportunities

Updating a résumé only when applying for a new job is not advisable. It's important to keep the résumé updated regularly and consistently, irrespective of whether one is looking for a new job or not. The other options, such as keeping up on one's professional reading, acquiring different skills required for the job, and staying alert to better job opportunities, are all beneficial for career growth and development. Keeping a finger on the pulse of the job market is also important, as it helps one stay aware of industry trends and potential opportunities for career advancement.