Please explain your answer.

4- A page fault happens if: Access is made to a virtual address that is not in RAM Process virtual address space is full -Physical memory runs out The memory manager decides to page memory to disk Q5- A thread enters a ready state when it: Needs to wait for some kernel object or I/O operation Wants to run but all processors are already running other threads Waits for a user interface message to arrive Calls the Sleep function Q6- A thread enters a ready state when it: Needs to wait for some kernel object or I/O operation Wants to run but all processors are already running other threads Waits for a user interface message to arrive Calls the Sleep function