| A. | By the CPU that contains a special refresh counter, only |
| B. | By an external refresh controller, only |
| C. | Either by the CPU or by an external refresh controller |
| D. | None of these |
Answer : B Explanation : |
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Option: A Explanation : Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. |
