big auto inc. is considering whether to set up a structured fixed income mandate to address the retired

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lives portion of its defined benefit pension plan. Which of these would not indicate that it would be appropriate to do so$?$

a$.$ the future cash flows on the retired lives obligationd are well$-$defined in terms of sizing and timing

b$.$ the structured mandate will contain all the fixed income assets allocated to funding the retired lives liabilities

c$.$ the retired lives liabilities are small relative to the overall assets and liabilities of the plan

d$.$ the structured mandate will contain all the fixed income assets allocated to funding the retired lives liabilities, and the retired lives liabilities are small relative to the overall assets and liabilities of the plan