Assume that an individual of AB/ab genotype is involved in a testcross and four classes of testcross progeny are found in equal frequencies. Which of the following statements is TRUE?

A) The genes A and B are on the same chromosome and closely linked.
B) The genes A and B are on the same chromosome and very far apart.
C) The genes A and B are probably between 10 and 20 map units apart on the same chromosome.
D) The genes A and B are likely located on different chromosomes.
E) The genes A and B could be located on different chromosomes or on the same chromosome and very far apart.