Concept:A telegram is a short message sent electronically at express speed to reach its destination faster than normal mail.
Explanation:The question describes an abridged message sent quickly so that it arrives before ordinary airmail letters.
Telegram best fits this description because it transmits brief written messages through telecommunication networks rapidly.
A telegram can be sent and delivered at any time of the day.
Charges for a telegram are based on the number of words in the message.
A telephone is a voice conversation, not an abridged written message.
Telex is a teleprinter exchange service, not specifically an express message delivery system.
NITEL is a telecommunications company, not a message service.
Therefore, the correct option is Telegram.
Answer:B. Telegram