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A computer has a $32$-bit address bus with a direct mapped cache, using $4$ bits for block offset, $16$ tag bits, and $12$ index bits.

Which of the following address pairs can be placed in the cache simultaneously?

  1. $\textsf{3AC6 F45 6}$ and $\textsf{26A3 545 6}$
  2. $\textsf{3F08 C30 4}$ and $\textsf{3F08 C37 1}$
  3. $\textsf{5E3C 768 0}$ and $\textsf{8F3C 768 A}$
  4. $\textsf{2233 445 5}$ and $\textsf{2233 445 C}$
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