Question 1: What is a DID (Direct Inward Dialing) and why is it different than an old-fashioned phone number?

A) DID is a code used for international calls, while old-fashioned phone numbers are only for domestic calls.
B) DID is a virtual phone number assigned to a specific device, while old-fashioned phone numbers are tied to physical phone lines.
C) DID is a type of encrypted phone number, while old-fashioned phone numbers are not encrypted.
D) DID is a prepaid phone number, while old-fashioned phone numbers require a contract.

Question 2: What is the primary purpose of number portability or porting in the realm of telecommunications?

A) To increase the revenue of service providers
B) To facilitate customers in switching service providers without losing their phone numbers
C) To enhance network security
D) To restrict customers from changing service providers

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