निम्नलिखित में से किस पेज रिप्लेसमेंट एल्गोरिथ्म को निष्पादित करने के लिए पेज संदर्भों (page references) के बारे में भविष्य की जानकारी की आवश्यकता होती है?

Consider a system with four processes and four resources: P1 holds R1 and requests R2 P2 holds R2 and requests R3 P3 holds R3 and requests R4 P4 holds R4 and requests R2 Each resource has exactly one instance. Which statement is correct?

A system has 18 instances of a single resource type, shared among n processes. If each process requires at most 5 instances, what is the maximum value of n for which the system can guarantee that a deadlock will never occur?