During which phase of cell reproduction does the cell's nuclear envelope begin to disappear?

Question

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BEFORE MITOSIS: 
Interphase: Interphase is the phase the cell is in before mitosis starts. In interphase, the chromosomes are duplicated, and the cell prepares for division. The chromosomes are uncondensed.
MITOSIS 
Stage 1 - Prophase: This is the first and longest stage of mitosis. The cell's chromosomes become visibly separate with each duplicated chromosome having two sister chromatids. The centrioles separate and move to opposite ends of the cell.
Stage 2 - Prometaphase: The nuclear envelope begins to disappear, and the chromosomes begin to attach to the growing spindle.
Stage 3 - Metaphase: All the chromosomes line up in the middle of the cell. This line is called the metaphase plate.
Stage 4 - Anaphase: The sister chromatids separate into individual chromosomes and are pulled apart. Note that the separated chromatids are now each considered individual chromosomes.
Stage 5 - Telophase: The chromosomes gather on each side of the cell as it begins to pinch. In animal cells, this pinching is called a cleavage furrow. In plant cells, this division is called a cell plate.
AFTER MITOSIS: 
Cytokenesis - After mitosis is complete, the cell divides in two, producing two daughter cells. Again, this process looks slightly different in plant cells than in animal cells. In animal cells, a cleavage furrow forms and the cell pinches into two daughter cells. In plant cells, a cell plate forms and the cell separates into two.
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During Which Phase of Cell Reproduction Does the Cell's Nuclear