Which of the follwing statements are correct?

A. Davisian model of cycle of erosion envisages space-dependent series of landform development.

B. Penck’s model of geographical cycle envisages time independent series of landform development.

C. Davisian geographical cycle over emphasized stage and gave less attention to structure.

D. Penck emphasized that geomorphic forms are expressions of phase and rate of upliftment in relation to rate of degradation.

Choose the correct answer from the options given below: