RAID 10 creates a second striped set of disks that is a mirror of another striped set

In the class BinaryNode, what value is stored in rootPtr if the tree is empty?

a. 0 b. -1 c. 1 d. nullptr

What do you do if you remove a node from a tree in an array-based implementation?

a. assign it to nullPtr b. nothing, leave it as is, just don’t link anything to it c. remove it from the array d. add it to the free list