Institution: AGRANI BANK LTD Exam: Agrani bank Ltd - Senior Officer - 12.02.2010
Topic: ICT (তথ্য ও যোগাযোগ প্রযুক্তি), Subject: Computer and ICT (তথ্য ও যোগাযোগ প্রযুক্তি)

Best Answer Explained in Below-:

The question pertains to the definition of a kilobyte (KB), which is a unit of digital information storage. Traditionally, there are two main definitions of a kilobyte: the binary definition and the decimal definition.

In the binary system, 1 kilobyte is defined as 2^10 bytes, which equals 1024 bytes. This is based on the binary nature of computers, where data is processed in powers of two. Therefore, when referring to 1 kilobyte in this context, it is equivalent to 1024 bytes.

Conversely, in the decimal system, particularly in contexts involving data transmission and storage devices, 1 kilobyte has come to be defined as 1000 bytes. This decimal system is not about the powers of two but rather a metric system of measurement.

Now, focusing on the options given:

- Option A (1000 * 8 byte) and Option B (1000 * 8 bit) refer to a misunderstanding of how bytes and bits relate concerning kilobytes, as they misinterpret the actual byte count.
- Option D (1000 bit) also does not correctly define a kilobyte.

Thus, among the provided choices, Option C (2^10 byte) accurately reflects the traditional definition of a kilobyte in binary terms, making it the correct answer.