A.it outputs [2, 4]

B.the code is erroneus and it will not execute

C.it outputs [0, 1, 2, 3, 4]

D.it outputs [4, 2]

A.a is not None

B.a () == 4

C.b () ==4

D.a ! =b

A.true

B.For

C.True

D.for

A.there are no such variables, all variables are shared among objects

B.a class variable

C.an object variable

D.an instance variable

A.abc

B.The code will cause a runtime exception

C.ABC

D.123