How do plants have different cells like root cells, gaurd cells, leaf cells and

How do plants have different cells like root cells, gaurd cells, leaf cells and flower petal cells? Your answers
The enzyme celldifferentiase is the lead enzyme that controls which DNA gets spliced into which cell early in the plants life.
All of the cells have different DNA that controls what type of cell they become.
A little garden gnome comes and whispers into the root hairs on full moon and that is how cell differentiate,
All of the cells in a plant have the same DNA and have certain genes turned on in some cells and turned off in others,