Classify each of the cost items $($a$-$h$)$ as one of the business functions of the value chain.

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Part $1$

Value Chain Business Function

a$.$

Payment of booth registration fee at a medical conference to promote new products to physicians

$$

Part $2$

Value Chain Business Function

b$.$

Cost of redesigning an artificial knee to make it easier to implant in patients

Part $3$

Value Chain Business Function

c$.$

Cost of a toll$-$free telephone line used for customer inquiries about its drugs

Part $4$

Value Chain Business Function

d$.$

Materials purchased to develop drugs yet to be approved by the government

Part $5$

Value Chain Business Function

e$.$

Sponsorship of a professional golfer

Part $6$

Value Chain Business Function

f$.$

Labor costs of workers in the tableting area of a production facility

Part $7$

Value Chain Business Function

g$.$

Bonus paid to a salesperson for exceeding a monthly sales quota