The$$ four$-$part need$-$satisfaction model includes$\_\_\_\_\_\_\_\_.$

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Part $1$

A$.$

needs$$ agreement, solution$$ selection, contracting$$ agreement, and servicing the sale

B$.$

needs$$ exploration, solution$$ selection, needs$$ satisfaction, and servicing the sale

C$.$

needs$$ discovery, solution$$ options, satisfaction$$ exploration, and servicing the sale

D$.$

needs$$ discovery, solution$$ options, needs$$ satisfaction, and servicing the sale

E$.$

needs$$ discovery, solution$$ selection, needs$$ satisfaction, and servicing the sale