What interface in C# contains the definition for the CompareTo() method that compares one object to another and returns an integer?

Which PNG save version will let you specify if an image is opaque or transparent?

What will be an ideal response?

If the item with a given search key does not exist in a table, the tableRetrieve operation returns ______.

a) the value -1 b) the value 0 c) the value false d) a null reference