The correct answer is C - Stream ciphers.
WGU Cybersecurity Architecture and Engineering (KFO1 / D488) content explains that stream ciphers encrypt data bit-by-bit or byte-by-byte, making them highly efficient and suitable for real-time applications like video conferencing where low latency is critical.
Block ciphers (A) encrypt large chunks of data, causing latency. Asymmetric encryption (B) is too slow for real-time data streams. Hash functions (D) are used for data integrity, not for ongoing data encryption.
Reference Extract from Study Guide:
"Stream ciphers encrypt data continuously and are ideal for real-time applications such as video or audio streaming where low latency is essential."
- WGU Cybersecurity Architecture and Engineering (KFO1 / D488), Encryption Technologies