Multiple choice general knowledge

Full form of STD?

  1. Systemized trunk dailing

  2. short trunk dailing

  3. standard transmitted dailing

  4. Standard Trunk Dialling
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

STD stands for Standard Trunk Dialling, which is the correct expansion. Option A has 'Systemized' and 'dailing' typo. Option B has 'short' and 'dailing' typo. Option C has multiple errors: 'standard transmitted dailing' is incorrect.

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