Reverse showrooming also known as webrooming involves

a$.$ customers researching a product online before purchasing it in$-$store.

b$.$ customers purchasing a product in$-$store where they can touch and feel it$.$

c$.$ customers purchasing a product online without ever visiting a bricks$-$and$-$mortar store.

d$.$ customers research a product at a bricks$-$and$-$mortar store before purchasing it online.