6. Which can exactly return 'Hello world!' as output? The expected output is: 'Hello world!' A. >>> print('Hello', 'world', '!') B. >>> print('Hello world!') C. >>> 'Hello' + 'world' + '!' D. >>> 'Hello' + " " + 'world' + '!' 7. Given the following statement, Which is the expected result? >>> s = "Python Programming" >>> s[7:10] A. 'Pro' B. ' Pr' C. 'rog' D. 'n P' 8. Given the following statements, Which is the expected result? >>> x = 5 >>> x < 4 False >>> type(x) A. B. C. D. False 9. Given the following statements, which object is mutable? >>> w = 'apple' >>> x = ['orange'] >>> y = ('banana') >>> z = "cherry" A. w B. x C. y D. z 10. Which has the lowest memory usage? A. x = '' B. x = "" C. x = 'None' D. x = None