When multiple objects appear on a slide, the first inserted object is positioned at the ________ of the stack

The default file format in Access 2013 is the .accdb extension

Indicate whether the statement is true or false

Which statement is false?

a. SortedSet extends Set. b. Class SortedSet implements TreeSet. c. When a HashSet is constructed, it removes any duplicates in the Collection. d. By definition, a Set object does not contain any duplicates.