Choose which portfolio is the optimal risk-return relationship if your client's volatility preference is less than 3.650%. stock 1 stock 2 MRNA, BND returnp 0.422% 0 0.134% Op 3.661% O MRNA, FLATX MRNA, SP500 O MRNA, SBUX MRNA SBUX MRNA, V MRNA MRNA FLATX 308 MRNA BND 0.414% 0.347% 0.403% 0.136% 0.131% 0.123% 3.686% 3.615% 3.514% MRNA SP500 0.419% 0.133% 3.652%