Best on both reliability and support with probability $0\mathrm{.}67$ Worst on both reliability and support with probability $0\mathrm{.}33$

B Best on reliability and worst on support

The decision maker also was indifferent between

C Best on both reliability and support with probability $0\mathrm{.}48$ Worst on both reliability and support with probability $0\mathrm{.}52$

D Worst on reliability and best on support

a$.$ What are the values for $k_x$ and $k_Y?$ Write out the decision maker's full two$-$attribute utility function for reliability and support.

b$.$ Are the two attributes substitutes or complements? Explain, both intuitively and on the basis of $k_x$ and $k_Y.$