Which of the following is not one of the classification levels for national security information?

The dtm prefix is used to denote a(n) ____ data type.

A. Boolean B. Char C. Single D. Date

In the following code for the pop method for a linked queue implementation, what is the missing code? def pop(self): oldItem = self.front.data self.front = self.front.next if self.front is None: self.rear = None return oldItem

A. self.rear -= 1 B. self.front = self.rear C. self.size -= 1 D. self.size += 1