Answer: Please see below as the answer is self-explanatory
Explanation:
Digital phones, normally uses a keyboard, with the digits 0-9, and special characters like # and *.
When the caller presses any keyboard, an electronic circuit within the phone generates two pure sinusoids, of frequencies within the vocal bandwidth (between 300 Hz and 3 khz, roughly), which identifies uniquely (as decoded by the receiving switch) which was the key pressed.
In this way, the switch reconstructs the phone number called, separating country code, area code and the local number as it receives the tones.
This system is called DTMF (dual tone multi frequency).
Answer: C. Interface.
Explanation:
File manager is an interface between the hardware part of a computer and the software. the main function of a file manager is to help the user manage all files which they have stored up on their computers. for example the file managers allows the users to view, copy, delete and edit the files which they have stored up on their computer storage devices.
Answer:
Ask to the client all the information about the problem and try to solve it by phone.
If its no possible to solve it by phone, then recall all the information about the problem, so the personal doing the on-site supports can pre-diagnose the problem and give an opportunity solution.
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