In which one of the following page replacement policies, Belady’s anomaly may occur?

The essential content(s) in each entry of a page table is / are:

What is the swap space in the disk used for?

Consider a program $$P$$ that consists of two source modules $${M_1}$$ and $${M_2}$$ contained in two different files. If $${M_1}$$ contains a reference to a function defined in $${M_2}$$, the reference will be resolved at.