Which one of the following is the reason that asymmetric encryption is not used to perform bulk encryption?

Which one of the following is the reason that asymmetric encryption is not used to perform bulk encryption?
A . Asymmetric algorithms are substantially slower than symmetric algorithms.
B . Asymmetric algorithms are easier to break than symmetric algorithms.
C . Symmetric algorithms can provide authentication and confidentiality.
D . Symmetric algorithms use a much larger key size.

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Answer: A