Data remanence is the residual representation of data that remains on a storage media after it has been erased or overwritten. Data remanence can pose a security risk if the storage media is disposed of, reused, or transferred without proper sanitization, as the residual data may be recovered by unauthorized parties using forensic tools or techniques. Different types of storage media have different levels of susceptibility to data remanence, depending on their physical characteristics, design, and technology. Among the four options, the media that is least problematic with data remanence is Dynamic Random Access Memory (DRAM). DRAM is a type of volatile memory that stores data using capacitors and transistors. DRAM requires constant power to maintain the data, and it loses the data when the power is turned off. Therefore, DRAM has a very low level of data remanence, as the data is quickly erased or decayed when the power supply is removed. Therefore, the correct answer is C. The other options are incorrect because they are types of non-volatile memory that retain data even when the power is turned off, and they have higher levels of data remanence than DRAM. Magnetic disk is a type of magnetic storage media that stores data using magnetized regions on a rotating platter.
Magnetic disk has a moderate level of data remanence, as the data can be partially recovered after one or more overwrites, using magnetic force microscopy or other techniques. Electrically Erasable Programmable Read-Only Memory (EEPROM) is a type of flash memory that stores data using floating-gate transistors.
EEPROM has a high level of data remanence, as the data can persist for years after erasure, and can be recovered using invasive or non-invasive methods, such as microprobing or power analysis. Flash memory is a type of solid-state memory that stores data using electrically programmable cells. Flash memory has a high level of data remanence, as the data can remain for a long time after erasure, and can be recovered using physical or logical methods, such as chip-off analysis or wear-leveling bypass. References: Official (ISC)2 CISSP CBK Reference, Fifth Edition, Chapter 8: Security Operations, Section: Secure Provisioning of Resources, Subsection: Media Management; CISSP All-in-One Exam Guide, Eighth Edition, Chapter 8:
Security Operations, Section: Media Management.