Auto Scaling requests are signed with a _________ signature calculated from the request and the user’s private key.
SSL
AES-256
HMAC-SHA1
X.509
Explanations:
SSL is a protocol for secure communication, not a signature method.
AES-256 is an encryption algorithm, not used for signing requests.
HMAC-SHA1 is a hashing method used to create a signature based on the request and a private key.
X.509 is a standard for public key certificates, not a signing method for requests.