Which of the following would be the best fit for a middle$-$level management position?

a$.$ Vladimir does not have the technical skills to help his employees but is able to work with teams and individuals and make important decisions.

b$.$ Juan is able to use quantitative reasoning to think of alternatives to problems while also having a strong technical understanding of the software systems used at the firm.

c$.$ Serena is an expert in computer programming and is able to work with her team and senior leadership, but struggles when thinking of altematives to problems.

d$.$ Dominic is equally good at decision$-$making, has strong technical skills, and is good at communicating with individuals and groups.