Which person is taking an effective approach to negotiating their salary?

a.) Carly, who explains that she needs a higher salary because she's having trouble making her car payments on time. 

b.) Franklin, who wants to earn as much money as his brother does even though they work in different industries, so he asks for that amount.

c.) Raymond, who uses an aggressive tone when asking for a higher salary so that his employer understands that he won't accept anything less. 

d.) Tamara, who researches average salaries for her position in her region of the country, and uses this data when asking for a higher salary.