Which of the following statements is TRUE?

a) Turbo Boost allows activating all available cores to execute multiple processes faster
b) Before being processed in the CPU, the data may be stored temporary in the cache memory
c) One core with Hyper-threading is usually faster than two separate cores without that technology
d) Hyper-threading enhances the performance of an ordinary core by allowing running two related instructions at the same time
e) Hyper-threading uses multiple cores to increase the processing speed