During gene flow, where do the genes flow?

a. the genes do not flow at all; flow is a mathematical metaphor for mean gene frequencies being unstable and drifting from one number to another.
b. the genes flow into and out of the population due to migration of individuals from one population to another.
c. the genes flow from a locus on one chromosome to another locus on the same chromosome.
d. the genes flow through cyberspace.
e. the genes flow from a locus on one chromosome to a locus on another chromosome.