Which of the following statements is true about what the Stanley Park Ecological Society recommends for the long term health of Beaver Lake? a) They recommend not dredging the lake, due to the potential for long term ecological damage. b) They recommend dredging the lake. Despite the initial ecological damage, this will result in deepening that will enhance the long term health of the ecosystem. c) They recommend that clearing invasive species will produce a negative feedback that will now destabilize the equilibrium of the lake. d) The recommend leaving the lake alone and let it naturally transition into a grassy meadow that can be enjoyed by park vitors.