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WAEC Commerce 1993 Question 56

Question 56

Communication

The telephone service through which one can dial any number, local, trunk or overseas is known as

  1. A.internal communication system
  2. B.standard dialling system
  3. C.subscriber's trunk dialling system
  4. D.international telecommunication
  5. E.coded dialling order
Show the answer and explanation

Answer: C (subscriber's trunk dialling system)

Explanation

Subscriber trunk dialling (STD) lets a caller dial long-distance numbers directly without an operator.