U.S. federal government employees are paid on a scale according to their grade and step. There are a total of 15 grades, each of which consists of 10 steps. Here's a table of 2017 annual salaries (in exist) for the first 3 grades and the first 4 steps from each: Write a program that uses the switch statement to determine the salary of an employee. Your program should allow the user enter two inputs: the grade and step. It should then display the appropriate salary based on the table above. You need to implement only the first 3 grades and first 4 steps. Include default cases to cover situations where the user enters an invalid grade or step. Do not use any form of the if statement in your program