Today, the Nielsen Television Index provides weekly estimates of networks and major cable viewing audiences on a national level using an electronic device that measures what is being watched and by whom. This device is called a(n): Multiple Choice
audimeter.
streaming server
chronometer
people meter
electronic diary

Audimeter

Explanation:

The television index is a measure of audience that estimates the percentage of households or viewers that are watching a television program and with respect to the total that your television is on during the broadcast. It manifests itself in a figure that results from the multiplication of individuals or households, by the time invested. This data is measured with audimeters.

streaming server

Explanation:

A streaming server allows the measurement to be made to determine who is watching what. This enables information to be stored in the backup servers for the purposes of use for services such as advertisements. The information may include frequently watched programs, frequently streamed sites, frequently searched questions, etc. In determining what viewers' choices are, the marketing teams often create advertisements that are audio specific. This enables the marketers to make an impact on the market.