Excel worksheets are saved in a(n) two-dimensional workbook.

Which choice best describes Bluetooth?

A. A transmission tool used to back up hard disks B. A method of data synchronization between devices C. A method of converting data from one type of media to another D. A secure transmission methodology

In a transaction processing system (TPS), the _____ system is sometimes referred to as the lifeblood of an organization.

Fill in the blank(s) with the appropriate word(s).