What distinguishes e$-$tailing from digital retailing?

Question $4$ options:

E$-$tailing focuses on online sales, while digital retailing encompasses a wider range of digital strategies.

E$-$tailing refers to physical retail stores, while digital retailing refers to online marketplaces.

E$-$tailing is a new concept, while digital retailing has been around for decades.

E$-$tailing involves brick$-$and$-$mortar stores, while digital retailing is exclusively online.