Answer:
3. 1. 2. daily, weekly, monthly
Explanation:
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The EINAC at the university of pennsylvania, completed in 1946. It weighed more than 50 tons.
Answer: D. enter each major point from the outline on a separate line
In terms of key hierarchy, you have to request to a Certification Authority in order for them to issue you an X.509 certificate. On the other hand, you can creat your own pgp.
In terms of key trust, X.509 supports only a sole key owner. It can support only one digital signature to confirm the key's validity. This does not work for pgp.