Select the one which is different from other three

For a comparison-based sorting algorithm, which lower bound applies to the worst-case number of comparisons?

In mobile computing, what is the main feature of pervasive computing?

In hashing, what is a collision?

What is the primary goal of Cyber Security?

Which of the following is considered the strongest type of encryption method in modern cyber security practices?      

Which algorithm uses a priority queue to repeatedly pick the next closest vertex?

In a Min-Heap, the root node is:

Worst case is the worst case time complexity of Prim’s algorithm if adjacency matrix is used?

In which case is QuickSort’s performance worst?

Output of below code

public class Prg {

public static void main(String args[]){

System.out.print("A" + "B" + 'A');

}