SLN1 receptor, a part of a two-component system, is required for osmoregulation in yeast. The yeast mutant (siln 1) lacking the SLN1 receptor protein dies. A researcher tries to rescue the mutant by expressing an Arabidopsis gene for the cytokinin receptor, CRE1, which like SLN1 is also a histidine kinase that acts through a two-component system.

The following statements are made regarding the outcome of the experiment.

A. SLN1 and CRE1 proteins respond to the same external signals and therefore, CRE1 rescues the yeast mutant.

B. As CRE1 cannot interact with the downstream signaling pathway in the yeast, it will not rescue the yeast mutant.

C. CRE1 will rescue the yeast mutant, only if cytokinin is present.

D. The effector domains of CRE1 and SLN1 proteins are sufficiently similar and therefore, CRE1 can induce the downstream signaling pathway and rescue the yeast mutant.

Which one of the following options represents the combination of all correct statements?