Why do many experts recommend against using a career objective as the introductory statement on your rsum?

Why do many experts recommend against using a career objective as the introductory statement on your résumé?

a. It focuses on what you want, not on what you can do for employers.

b. Job titles change too quickly.

c. It shows that you’re unrealistic because no one can plan a career that might last for 40 or 50 years.

d. It helps focus you as a candidate in the minds of potential employers.