Select the person who is displaying characteristics of an effective leader.

a$.)$Andrew$,$ who spends long periods away from the office and relies on email to communicate with his team.

b$.)$Emma$,$ who delegates very little to her junior associates so she can ensure quality.

c$.)$Sheyda$,$ who asks Dan to create the visuals for their presentation because she knows he's good at graphics.

d$.)$Jacek$,$ who uses the same strategy to motivate all of his employees, regardless of their individual differences.