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“Be a millionaire” a slogan adopted by one of them G.S.M providers is an example…

“Be a millionaire” a slogan adopted by one of them G.S.M providers is an example of
  • A.
    advertising
  • B.
    credit to customers
  • C.
    customer service
  • D.
    sales promotion
  • E.
    trade discount
Correct Answer: Option D
Explanation