What precedes reformation of nuclear envelope in M-phase

Which one of the following precedes reformation of the nuclear evelope during m-phase of the cell cycle

Which one of the following precedes re-formation of the nuclear envelope during M phase of the cell cycle.

Which one of the following precedes re-formation of the nuclear envelope during M phase of the cell cycle.

Which one of the following precedes re-formation of the nuclear envelope during M phase of the cell cycle.

Which one of the following precedes re-formation of the nuclear envelope during M phase of the cell cycle.

Which one of the following precedes re-formation of the nuclear envelope during M phase of the cell cycle.

What are the functions of nuclear envelope?