Which of the following are true of Disability Adjusted Life Years or DALYs? ( )

A、A DALY combines years of life lost because of early death and years of life lived with disability or illness.
B、DALYs enable us to compare the disease burden between, for example, depression and breast cancer.
C、DALYs help policy-makers to compare diseases and decide priorities.

D、A country with a lot of DALYs has lower levels of disease and early mortality.