Question: What is required for communication between the O&M systems and the RNC in an exposed location to prevent unauthorized access?
Option 1: Only integrity protection
Option 2: Confidentiality, integrity, and replay protection from unauthorized parties
Option 3: Only confidentiality protection
Option 4: No security protection is required
Explanation: To ensure the security of communication between the O&M systems and the RNC in an exposed location, it is necessary to protect against eavesdropping (confidentiality), tampering (integrity), and replay attacks. This requires confidentiality, integrity, and replay protection from unauthorized parties, making Option 2 the correct answer.