The right answer is telophase.
The cell plaque is a structure that forms at the end of the cell division of plant cells and some algae, which is the cytokinesis, which is the precursor of the dividing wall that will separate the two daughter cells.
Cytokinesis in plants take place through the formation of a fragmoplast, which is a set of microtubules and vesicles that are located in the center of the cell, and the construction in that place of a cellular plaque.