Take context from the input text and decide on the accurate relationship between 'MasterCard' and 'purchase' from the options provided.
Options: operator, brand, industry, headquarters location

“Accepted in over 210 countries, wherever MasterCard is accepted, the creditcardsare by far the fastest way to earn Miles with a ticket purchase to fly on SAA or make qualified merchant purchases,” said Samuel Ashitey Adjei, MD of Ecobank Ghana.
headquarters location