Which of the following describes a volatile memory?

• A. Data is retained when powered off
• B. Data is lost when powered off
• C. Data cannot be written to
• D. Data remains forever

Answer: (B)

Volatile memory is characterized by its dependence on power to maintain the stored information. When the device is turned off or experiences a power loss, the data stored in volatile memory is erased. This type of memory includes RAM (Random Access Memory), which is used by computers and devices to store data temporarily while they are in use.

In contrast, non-volatile memory (like ROM, flash memory, and hard drives) retains data even when the power is turned off, which explains why options referring to data being retained or remaining forever do not describe volatile memory accurately. Additionally, while some types of memory may have write-protection features, the defining aspect of volatile memory is specifically its temporary nature in relation to power status.