What is STD?

Simple Trunk Dialing

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Subscribers Trunk Dialing

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Secure Trunk Dialing

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Self Trunk Dialing

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Solution

The correct option is B Subscribers Trunk Dialing
STO is Subscriber Trunk Dialling is a telephone system allowing subscriber to dial true calls( i.e a method for a system to provide network access to many clients by sharing a set of lines or frequencies instead of providing them individually ) without operator assistance

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