Question

Mobile advertising is a great tool for marketers, but all that good work could be undone if your website isn't what?

Answer 1

in place of what I think there will be correct

Answer 2

All that good could be undone if your website is not updated. As a business person you have to make sure that your website is up to date all the time as you inform your potential customers what now products are in stock. This is the only way you can keep customers engaged and wanting to buy more from you. So, before you think of online advertising make sure your website is updated, everyday.