Which of the following investment vehicles are most appropriate for an emergency fund for a family with discretionary income of $12,000 a year?

I. Balanced index ETF.
II. CD ladder with maturities every 90 days.
III. Home equity line of credit.
IV. Money market mutual funds.
A. I, II.
B. II, IV.
C. Ill, IV.
D. I, II, III