Which of the following statements about lists are true? check all that apply. list elements could be of different types. unlike strings, lists are mutable and their elements can be added and removed during the program execution. a list may contain mutliple data items. unlike strings, list elements cannot be accessed using their position / index. list elements appear within curly braces and are delimited with a comma, e. g. {1, 2, 3} in a manner similar to strings, python supports list repetition, concatenation, and slicing.