Which of the following is an approach to designing apps and websites that provide an optimal viewing experience across as many devices as possible?

Analyze the following code:

``` public class Test { public static void main(String[] args) { double radius; final double PI= 3.15169; double area = radius * radius * PI; System.out.println("Area is " + area); } } ``` a. The program has compile errors because the variable radius is not initialized. b. The program has a compile error because a constant PI is defined inside a method. c. The program has no compile errors but will get a runtime error because radius is not initialized. d. The program compiles and runs fine.

Discuss the effect on all operations on a stack if there were not a count variable in the implementation.

What will be an ideal response?