Sheila is organizing desks in her classroom in
preparation for a class of at least 25 students. She
wants the desks to be arranged in a rectangle. Due
to the dimensions of her classroom, she cannot
reasonably fit more than 6 desks in any row or 7
desks in any column. When trying to figure out
how Sheila can arrange her room, which of the
following is not a meaningful criterion in terms of
the number of rows of desks r and the number of
columns of desks c?