A process has four page frames allocated to it. (All the following numbers are decimal and everything is numbered starting from zero). The time of the last loading of a page into each page frame, the last access to the page in each frame, the virtual page number in each frame, and the referenced (R) and modified (M) bits for each frame are as shown (the times are in clock ticks from the process start at time to the event), A page fault to virtual page 23 has occurred at time 164. Which frame will have its contents replaced under the OPT memory management policies? Consider the reference string that follows is: 20 31 34 20 23 Virtual Page Number Frame Time Loaded Time Referenced 20 0 60 161 22 1 130 160 24 2 10 162 31 3 20 163 22 31 22 or 24 24