market rates at the end of Years $1,2,$ and $3$ are as follows:

a$.$ Calculate the required ending$-$wealth value for this portfolio.

$$,$ million

b$.$ Calculate the required ending$-$wealth value for this portfolio at the end of Years $1,2,$ and $3.$

End of Year $1$: $

million

End of Year $2$: $

million

End of Year $3$: $

million

c$.$ Compute the margin of error at the end of Years $1,2,$ and $3.$

End of Year $1$: $

million

End of Year $2$: $

million

End of Year $3$: $

million

d$.$ Indicate the action that a portfolio manager utilizing a contingent immunization policy would take if the margin of error at the end of any year had been zero or negative.

If the margin of error at the end of any year had been zero or negative, the portfolio manager would $-$ select$-,v$ active management of the portfolio and immunize it$.$