Question

demand paging:

a. allows a program to start before most of its code is loaded into memory.

b. can map a file into memory without initially using any physical memory.

c. requires a sophisticated page replacement policy such as MIN to work properly.

d. cleans dirty pages on demand.

Answer 1

answer is option b

explanation:-in demand paging the process will begins the its execution even though none of its pages are not present in the main memory and when ever any page required on demand it will be loaded from secondary memory to main memory because of this lot of page faults will occur.