How do you denote which code is scoped under a particular block in Python $($inside an if statement or a loop$)?$

Group of answer choices

Do$..$End, blocks begin with $"$Do$"$ and end with "End"

Parentheses, blocks begin with a $($ and end with a $)$

Whitespace, code inside a block is tabbed over using spaces or tabs

Curly braces, blocks begin with a $\{$ and end with a $\}$