The cell wall is
interior to the cell membrane
exterior to the cell membrane
a part of the cell membrane
interior or exterior, depending on the particular cell

exterior to the cell membrane

Explanation:

The cell wall is exterior of the cell membrane.

Only plant cells, fungi, and some bacteria have this, made of cellulose, and its purpose is to give structure, and strength to the cell.

Also, the cell wall prevents the cell from exploding by overhydration.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.