What does the following code print? ist = [] nums = (15, 6] ist.append(nums) nums = [10, 30, 20) Ist.append(nums) ist.sort() print(est) Select one: O a. [[10, 20, 30). 16, 15]] O b. [[6, 15). [10, 20, 30]] O c. [6, 10, 15, 20, 30] O d. [[10, 30, 20). [15, 6]] e. [[15, 6), [10, 30, 20]]