In demand paging schemes, the ____ in a Page Map Table indicates whether the page is currently in memory.

A ________ defines the criteria that should be applied when the query is run

A) WHERE clause B) SELECT clause C) JOIN clause D) FROM clause

A priority queue is

A) a binary search tree in which the heights of the subtrees at each node differ by at most one B) is an AVL tree in which the root is the minimum element C) is a binary search tree that stores elements according to their natural order D) is a collection that allows elements to be added, but only allows the minimum element to be removed