Discussion
The speed of information being transferred in and out of memory depends on which of the following parameters ?
(i) Access time \(t_{\mathrm{A}}\)
(ii) Cycle time \(t_{c}\)
(iii) Access rate \(r_{\mathrm{A}}\)
(iv) Bandwidth \(r_{c}\)
Answer: A
The key is (i) and (ii), access time and cycle time, and it rests on how the question reads the list.
Memory speed is set by two times: the access time \(t_{\mathrm{A}}\), from a request to the data being available, and the cycle time \(t_{c}\), the minimum gap between two successive operations. The access rate \(r_{\mathrm{A}}\) and the bandwidth \(r_{c}\) are the reciprocals of those two (\(r_{\mathrm{A}} = 1/t_{\mathrm{A}}\), \(r_{c} = 1/t_{c}\)), so they restate the same speed as rates rather than add a separate dependence.
On that reading A is the answer, and every option that adds (iii) or (iv) is wrong. A reader who counts the rates as parameters the speed depends on could choose D, and no source found settles which the question intends, so this follows the key.
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