Consider the following code that assigns a letter grade to a student's score: if (score > = 90) grade = 'A'; end if (score > = 80) grade = 'B'; end if (score > = 70) grade = 'C'; end if (score > = 60) grade = 'D'; else grade = 'F'; end This " cases This code will work correctly in all cases This code will work correctly only if grade > = 60 This code will work correctly only if grade 1)) && (x x > 100) || (x 1)) || (x