If a Healthy Ecosystem Experiences a Drought for Several Years

If a healthy ecosystem experiences a drought for several years, and then the normal rain pattern returns what would you expect to happen?

A) A healthy and stable ecosystem will recover from the drought and quickly return to its previous state once the rains return.
B) A healthy and stable ecosystem will recover from the drought once the rain returns, but most of the plants that were there will have been replaced by new species.
C) Even a healthy ecosystem cannot recover quickly from an extended drought. I will recover but with an entirely new suite of species.
D) There is no way for an ecosystem to recover from an extended drought. New drought-resistant plant species will have taken over and the original animal species will have moved out or died off.
E) It completely depends on what the original productivity was. A previously highly productive ecosystem will quickly bounce back. An ecosystem that already had low productivity but lost it, will never get it back.