Final answer:
MMPs are a group of calcium-dependent proteases that play a role in the metastatic processes of most human tumors. They can be activated by radiation.
Step-by-step explanation:
MMPs or matrix metalloproteinases are a group of calcium-dependent proteases that play a role in the metastatic processes.
They are involved in the invasion, progression, and metastasis of most human tumors.
In addition, MMPs can be activated by radiation, making option D - 'A, B, and C all are correct' the correct answer.