For the following four statements, state if the statement is correct or incorrect. If you think it is incorrect, explain why and what a correct statement would be. (a) Around 2006, Moore's law did not hold anymore. As a consequence, larger proces- sor manufacturers started to produce multicore processors (b) The term power wall typically means that the maximum clock speed has been reached and that chips would be too hot if they were clocked at higher frequencies. (c) Programming concurrent programs that achieve high parallel execution is a hard, but recently solved problem. (d) Before the multicore era, speedup by executing programs in parallel was basically not possible