CCE is the smallest resource unit for PDCCH transmission. Which of the following descriptions about CCE are correct? (Multiple choice)

CCE is the smallest resource unit for PDCCH transmission. Which of the following descriptions about CCE are correct? (Multiple choice)
A . When the channel condition is good, the system message will use the PDCCH of 1CC
C . PDCCH with aggregation level 1 with the highest code rate and the worst demodulation performance
D . PDCCH with aggregation level of 8 with the lowest code rate and best demodulation performance
E . eNodelB can be 1, 2, 4, 8 CCEs polymerized together to form a PDCCH

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Answer: BCD