Chandra owns a pet sitting service. She recently paid a web developer to build a special version of his company website for use on smartphones. Customers will now be able to easily place orders for pet sitting on their cell phones. This is an example of

The answer is mobile commerce.

Explanation:

Also known as M-commerce, the term refers to providing products or services via mobile devices. It started though SMS advertising, and later evolved into the use of e-mail and cell phone apps to make transactions, usually through credit or debit cards.

Some studies show that M-commerce is the preferred buying method by young adults.