A geneticist crossed two tomato plants that were both heterozygous for two autosomal genes: stem colour (purple stem, $A$, is dominant to green stem, $a$) and leaf shape (cut leaves, $L$, is dominant to potato leaves, $l$). Both parent plants had the genotype $AaLl$.

Assuming no crossing over occurred, the offspring of this cross showed only three phenotypes in the following ratio:

• 1 purple stem, potato leaves
• 2 purple stem, cut leaves
• 1 green stem, cut leaves

The diagram shows four possible arrangements of these alleles in a diploid cell.

Which chromosomal arrangement represents the parent plants?