In the GSM system, each user is assigned a unique IMSI (International Mobile Subscriber Identity) for identification of the user’s identity. Which of the following parts does IMSI consist of?
A . The IMSI consists of MCC (Mobile Country Code), MNC (Mobile Network Number) and NMSI (National Mobile Subscriber Identity);
B . The IMSI consists of MCC (Mobile Country Code), MNC (Mobile Network Number) and MSIN (Mobile Subscriber Identity Number);
C . The IMSI consists of MCC (Mobile Country Code), MNC (Mobile Network Number) and SN (User Number)
D . The IMSI consists of MCC (Mobile Country Code), MNC (Mobile Network Number) and MSRN (Mobile User Roaming Number).
Answer: B