Which of the following is true of financial services provided by persons working in banks, insurance companies, and brokerage firms?

a$.$ Persons working in banks, insurance companies, and brokerage firms help public corporations follow environment$-$friendly practices.

b$.$ Persons working in banks, insurance companies, and brokerage firms help corporations in framing their bylaws.

c$.$ Persons working in banks, insurance companies, and brokerage firms help investors achieve the highest earnings per share.

d$.$ Persons working in banks, insurance companies, and brokerage firms help corporations fulfill the regulations required by the Sarbanes$-$Oxley Act.

e$.$ Persons working in banks, insurance companies, and brokerage firms help individuals and companies determine how to invest money to achieve their financial goals.