Which is not a disadvantage of symmetric cryptography a. Speed b. No true means to authenticate the sender c. Breaking one key compromises multiple parties d. Math algorithms are complex and can easil?

d. Math algorithms are complex and can easily be broken is not a disadvantage of symmetric cryptography. In fact, symmetric cryptography typically involves simpler mathematical operations that allow for fast encryption and decryption. The other options highlight significant drawbacks, such as the speed of encryption, lack of sender authentication, and the risk of compromising multiple parties if a single key is broken.