What is the difference between credit and debit? O
A. Credit always refers to transactions with a credit card while debit
always refers to transactions with checks.
B. Credit is for major purchases while debit is for smaller purchases.
C. Credit is used internationally while debit is used within the United
States.
D. Credit is built on trust that the buyer will pay while debit is
deducted from an account balance.

Consider a treasury bill with a rate of return of 5% and the following risky securities: security a: e(r) = .15; variance = .0400 security b: e(r) = .10; variance = .0225 security c: e(r) = .12; variance = .1000 security d: e(r) = .13; variance = .0625 the investor must develop a complete portfolio by combining the risk-free asset with one of the securities mentioned above. the security the investor should choose as part of her complete portfolio to achieve the best cal would be a. security a b. security b c. security c d. security d