The feedback control of the lysine biosynthesis pathway in Arabidopsis thaliana is described below. The activity of Dihydrodipicolinate Synthase (DHDPS) enzyme is feedback inhibited by Lysine only, whereas the Aspartate kinase (AK) enzyme is feedback inhibited by Lysine and Threonine synergistically. Feedback-resistant mutant lines of DHDPS and AK genes are dhps1-1D and ak1-2D, respectively.

The phenotypes of these feedback-resistant mutants were analyzed by growing them in the following Murashige and Skoog (MS) medium combinations:

Which one of the following statements is correct?