Answer:
The oldest malware vector was emails.
Explanation:
Websites were not widespread early on into the internet, however it was very easy to have a virus that uses an email contact list, where it can send itself to other email addresses and spread.
Mechanical mouse has a ball that turns rollers inside. If friction is lost between the ball and the mousing surface, or between the ball and the rollers, the mouse fails to work. In order to assure good contact with the mousing surface, the ball must be fairly heavy. When you change directions with the mouse, you must make the ball change rolling directions--an action that inertia likes to prevent.
An optical mouse makes use of an LED and some optics to detect surface texture and the changes in it as the mouse is moved. There are no moving parts
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The way a particular application views the data from the database that the application uses is a sub-schema.
<h3>What is Database?</h3>
A Database may be defined as a process of collecting data and information that is principally assembled for quick search and recoupment by a computer.
The sub-schema is the reasoning elucidation of that section of the database which is applicable and accessible to a specific application. This type of database is common to two or more applications.
Therefore, the sub-schema is the way through which a particular application views the data from the database that the application uses.
To learn more about Database, refer to the link:
brainly.com/question/26096799
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