Through its Supplier Added Value Effort$$ program, Pittsburgh$-$based PPG industries challenges its suppliers of$$ maintenance, repairs, and operating goods and services to deliver on annual$$ value$-$added$/$cost$-$savings proposals equaling at least$5\%$ of their total annual sales to PPG$.$ This is an example of how$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ result$($s$)$ in suppliers customizing their offerings for individual customer needs.

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Part $1$

A$.$

professional purchasing

B$.$

multiple buying influences

C$.$

close$$ supplier$-$customer relationships

D$.$

fluctuating demand

E$.$

multiple sales calls