How does the $80/20$ rule apply to content marketing?

a$.$

$80\%$ of the budget should be spent on social media

b$.$

$80\%$ of sales come from $20\%$ of products

c$.$

$80\%$ of content should be promotional, and $20\%$ informational

d$.$

$80\%$ of marketing results come from $20\%$ of the content