Which two algorithms must be used when an engineer is creating a connection that will have classified data across it? (Choose two.)

RSA-3072 is an asymmetric encryption algorithm primarily used for key exchange or digital signatures, not typically for bulk data encryption of a connection.

ECDSA-256 (Elliptic Curve Digital Signature Algorithm with a 256-bit key) is used for digital signatures, providing authentication and integrity, but not directly for encrypting the data stream itself.

AES-256 (Advanced Encryption Standard with a 256-bit key) is a robust symmetric encryption algorithm widely regarded as secure enough for classified data due to its strong key length and resistance to known attacks, providing confidentiality.

RC4 is a stream cipher that is considered insecure and has known vulnerabilities, making it unsuitable for protecting classified data.

SHA-384 (Secure Hash Algorithm with a 384-bit output) is a cryptographic hash function that provides data integrity and authentication by generating a fixed-size digest of the data, which is crucial for classified data to detect any tampering.