This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Allied Health Sciences, Subject name: Social & Preventive Medicine
'Critical path' in Network analysis is:- 
Select and explain. 
A. Red path, B. Purple path, C. Green path, D. Black path
A: Red path
Answer: A: Red path 
Explanation: Network analysis contain: PE - Programmed evaluation & Review technique - sequence of activities. CPM - Critical pathway method (longest path) Red path - 3+1+3 weeks - 7 weeks - Longest path Purple path - 3 + 2 weeks - 5 weeks Green path - 4+ 2 weeks - 6 weeks Black path - There is nothing like Black path in Image