4. (15%) Create a program that determines if two lines are parallel or not. (a) The counting process should be implemented in a function named is_parallel. This function takes as input two floating point arrays of size 3 representing the coefficients of a line in standard form (ar +by =c). (b) The function should return 2 if the lines are equal, 1 if they are parallel but non-overlapping, and 0 if they are not parallel. (C) Your code should be properly formatted to reflect the scope of each statement. (d) Save your code as is_parallel.c