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

Best Answer Explained in Below-:

The correct answer is A) terabyte, as it represents the largest unit of digital storage among the provided options. To understand this, it is essential to know the hierarchy of data measurement in computing.

1. **Kilobyte (KB)**: This is the smallest unit listed here, consisting of 1,024 bytes. It is commonly used to measure small files such as text documents.

2. **Megabyte (MB)**: One megabyte equals 1,024 kilobytes, or approximately one million bytes. This unit is often used for larger files like images and audio.

3. **Gigabyte (GB)**: A gigabyte is equal to 1,024 megabytes, or around one billion bytes. This unit is widely used to quantify the size of computer hard drives and memory cards that store applications and large files.

4. **Terabyte (TB)**: The terabyte is the largest unit in this set. One terabyte equals 1,024 gigabytes, or about one trillion bytes. Terabytes are commonly used for measuring data storage capacity in larger systems like data centers, external hard drives, and cloud storage.

In summary, the terabyte is significantly larger than the other options, making it the largest unit of storage among the choices provided.