(You may choose more than one answer) In his lecture, William Ackman advised college students to start investing a. immediately, in spite of existing low interest Student loan debt but without high interest credit card debt b. only after paying off existing low interest student loan debt and high interest credit card debt c. immediately, in spite of existing low interest student loan debt and high interest credit card debt Od after you have money set aside that you don't need for 5-10 years e. after you have money set aside for 6-12 months in an emergency fund