Answer D, SL0-SL4

Definitely option D Page 138 shows the table with SL0-SL4 so total 5 security levels . Don’t ignore security level 0

Please note that there are five levels, but the first one is "SL 0" which you guys are not counting, but the official document IC32M says "In the 62443s, security levels are defined in five different levels. Starting with security level zero, where there are no specific requirements or security protection necessary."

Answer B

B. ISA Secure program has three levels of security certifications, namely ISASecure SSA Level 1, ISASecure SSA Level 2, and ISASecure SSA Level 3.

Correct Answer is C - 4: SL1 - Casual - Low Resource SL2 - Intentional - Simple Means, Low Resource SL3 - Intentional - Sophisticated Means, Moderate Resource SL4 - Intentional - Sophisticated Means, Extended Resource

Its C, 4. 1.Protection against casual or coincidental violation 2. Protection against intentional violation using simple means with low resources, generic skills and low motivation 3. Protection against intentional violation using sophisticated means with moderate resources, IACS specific skills and moderate motivation 4. Protection against intentional violation using sophisticated means with extended resources, IACS specific skills and high motivation