Isabella learned about a smartwatch when browsing a catalog. She then researched it on the company's website. Then she went to a retailer in the mall to try it on$.$ Isabella finally purchased the watch using a mobile app. This example shows that $q,$

a$.$ customers use a single channel marketing strategy

b$.$ retailers use intensive distribution as their marketing strategy

c$.$ customers use a multichannel marketing strategy

$$ d$.$ retailers use exclusive distribution as their marketing strategy