Thomas has been a commercial underwriter for four years. He has strong technical knowledge and is working on obtaining insurance designations. He meets or exceeds most of his performance objectives, and has strong interpersonal skills. During a recent performance review, Thomas said that he was not interested in managing other underwriters. Instead, he expressed an interest in adding some diversity to his daily activities.

Which one of the following types of career paths does Thomas seem interested in pursuing?
A. Declining career path
B. Vertical career path
C. Fast-track career path
D. Horizontal career path