কীবোর্ড থেকে সিপিইউতে ডেটা স্থানান্তরের সময় ব্যবহৃত ট্রান্সমিশনের বৈশিষ্ট হলো-
i. ডেটা ব্লক আকারে স্থানান্তরিত হয়।
ii. যে কোন সময় ডেটা প্রেরণ ও গ্রহণ করতে পারে
iii. প্রাইমারি স্টোরেজ ডিভাইসের প্রয়োজন হয় না

The provided answer is "ii ও iii," which means options ii and iii are correct regarding the characteristics of data transmission from the keyboard to the CPU.

Explanation:

    
• Option ii: States that data can be sent and received at any time. This flexibility is a key feature of data transmission, allowing for real-time communication without waiting for a specific moment to transfer data.
    
• Option iii: Indicates that there is no need for a primary storage device for this process. Data can go directly from the keyboard to the CPU, which streamlines the transmission process and removes the dependency on additional storage.

On the other hand, option i, which states that data is transferred in blocks, isn't valid in this context since the data from a keyboard is typically sent as single characters or key presses rather than in large blocks. Therefore, the correct selections are indeed ii and iii.

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