According to the$80/20$ rule, which of the following is$$ true?

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Part $1$

A$.$

$80$ percent of a$$ product's customers account for $20$ percent of the$$ product's marketing expenditures.

B$.$

$80$ percent of a$$ product's marketing cost should be equal to $20$ percent of the$$ firm's total marketing budget.

C$.$

$20$ percent of a$$ product's customers account for $80$ percent of the$$ product's marketing expenditures.

D$.$

$80$ percent of a$$ product's sales come from $20$ percent of the$$ product's purchasers.

E$.$

$80$ percent of a$$ product's market should be consumers who are $20$ or older.