Carole, a high-income earner, has asked you to recommend the savings vehicle that she should prioritize depositing her savings to. You know that Carole has a long-term investment goal of retiring early, no need for current income, and a high risk tolerance. Select the investment vehicle that you would recommend.

A. Tax-Free Savings Account (TFSA).
B. High-Interest Savings Account.
C. Money-Market Investment Fund.
D. Registered Retirement Savings Plan (RRSP).