a - In a concurrent system it is necessary to implement atomic actions. Explain what atomic actions are and why they are necessary. How are atomic actions implemented in Java? Write a class called Counter that has two public methods: inc() that increments the value of the counter and dec() that decrements its value. Your class should be thread safe.

b - Write a parallel stream code to extract all odd numbers from a data list of size 1,000,000 random integer elements, and return a list containing the square of each odd number found.

c - What complicates the debugging process for parallel code, and if you were to build a debugging tool, what features might you provide to help programmers track down their bugs productively?