In her Introduction to Computers class, Mariana has learned that collecting data is a crucial function for a management information system $($MIS$)$ to provide information. Which of the following is correct regarding the "collecting data" function?

Most of the data gathered for an MIS come from external sources.

There are two data sources: primary and secondary$.$

Inaccurate data can be disastrous to a firm.

External sources of data include managers and employees, company records and reports, accounting data, and minutes of meetings.