The cell theory applies to multicellular organisms, bacteria and plants and animals.
The cell theory:
Cell theory is a theory that says all living organisms are made up of cells, cell is the basic structural,functional unit of all living organisms and every cell come from pre-existing cell. The cell is basic unit of reproduction also.
Viruses are not true cells. They lack the some important part of the cell i.e the protoplasm and hence the cell theory is only not applicable to viruses.
therefore, The cell theory applies to all answer are correct (option 2) is the correct answer.
To learn more about cell theory, refer to:
https://brainly.com/question/10764427
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