Which of these employees is demonstrating a proactive learning orientation?

Charlie is interested in applying for the management position at work and feels he has enough skills for the job.

Millicent is taking a computer coding class at the community college so she can apply for a new role at work.

Rosa has worked in her department for $12$ years and often acts as a mentor for new hires.

Grigor often takes the lead in volunteer opportunities at the office.