A CPU is accessing a two-level memory. Access time to second level memory is 40 ns. The CPU first accesses the first level, if there's not it accesses the second level, for the data sought. The probability of finding the searched data in the first level memory is 0.80. The average access time to information for this memory system is 20 ns. Calculate the access time to the first level memory based on this information. 

A) 12ns 

B) 8ns

 C) 32ns 

D) 16ns 

E) 10ns

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