Which of the following is not a strategy for diversifying your portfolio A. Purchasing stocks from different company sizes: large, mid, small cap
B. Purchasing stocks from different industries E. G. technology, health care, energy
C. Purchasing investment vehicles that negatively correlate against others E. G. bonds and cryptocurrencies
D. Purchasing a commodity E. G. gold and putting all you money into it

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.