Explanation:

1. Numerical Calculation:

   • Savings account rate = 3%
   • Additional premium required for 2-year CD = 1.5%
   • Minimum yield required = 3% + 1.5% = 4.5%

2. Conceptual Understanding:

   • The question describes the minimum amount required to induce investors to lend funds to the bank.
   • This is best described as a required rate of return - the minimum return investors demand for providing capital given the time commitment and risk.
   • A discount rate is typically used to calculate present values, not to describe investor return requirements.

3. Why not Option C:

   • While 4.5% is numerically correct, it represents a required rate of return, not a discount rate.
   • A discount rate is used to discount future cash flows to present value, whereas a required rate of return is what investors demand to invest.

4. Why not Option B:

   • 4.0% would be incorrect as it uses the 1-year premium (1.0%) instead of the 2-year premium (1.5%).
   • The question specifically asks about 2-year CDs, so the 1.5% premium applies.

Key Concept: Required rate of return represents the minimum return investors require to invest in a particular security, considering factors like time horizon, risk, and opportunity cost.