Canco is incorporated on January 1, 2020. As it anticipates minimal sales in 2020, and the expenses subject to GST/HST would be minimal, it does not register for GST/HST. Suppose that Canco has a better than expected start to operations and is required to register as of July 1, 2020. Which of the following statements accurately describes the GST/HST consequences to Canco?

• Canco must go back and charge the tax to all its customers before the date it registered.

• Canco must go back and charge GST/HST on the transaction that caused it to exceed the $30,000 limit.

• Canco must remit the GST/HST it should have charged on all its sales, prior to registration, but can claim ITCs on all its expenditures during that time.

• The period prior to registration is ignored for GST/HST purposes, and Canco begins to charge GST/HST on a go-forward basis only.