Q) Which of the following statement(s) is/are true? [Python 3]

1) The smallest unit in a string list (i.e. a list full of string items) is the character.

2) We must add an escape character (\) to print a square bracket in a string.

3) Once a list is defined, we cannot modify it.

4) There must be at least one item in a list.

5) A list can store items in different data types, even another list.