Which of the following emits a magnetic field and monitors that field?
A. Infrared sensors
B. Electromechanical systems
C. Capacitance detector
D. Acoustical systems
C. A capacitance detector emits a magnetic field and monitors that field.
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Which statement is true regarding differential / incremental backups?
A. A differential backup copies all files changed since the last full or differential backup. B. An incremental backup copies all files changed since the last full backup; doesn't mark files as backed up. C. Differential backups copy all files to the selected media and marks files as backed up. D. Incremental backups copy all files changed since the last full or incremental backup and marks files as backed up.
Assume that R and S are tables representing the relations of the previous exercise. Design SQL queries that will return the results of each of the expressions of that exercise.
What will be an ideal response?