The digital telecommunications term ISDN is an abbreviation for _______.

Correct option is D

ISDN (Integrated Services Digital Network) is a set of communication standards for digital transmission of voice, video, data, and other network services over traditional circuits of the public switched telephone network (PSTN).
Important Key Points:
1. ISDN allows the simultaneous transmission of voice, video, and data using a single network connection.
2. It provides higher data transfer speeds compared to traditional analog systems.
3. ISDN is commonly used for video conferencing, internet access, and telecommunication services.
Knowledge Booster:
· Integrated Standard Digital Networks: Incorrect, does not represent ISDN.
· Internet Services Data Network: Incorrect, unrelated to ISDN.
· Interactive Standard Dynamic Networks: Incorrect, not a valid term.