Two genetic markers are separated by $2.4 \mathrm{cM}$ on a genetic map. What does this mean?
a. If the chromosome is stretched out, the two markers are physically $2.4 \mathrm{~cm}$ apart along the chromosome.
b. There is a $2.4 \%$ chance they will be separated by recombination during meiosis.
c. They will be expressed together in a cell $2.4 \%$ of the time due to their proximity.
d. None of the above