For any nonzero 8-bit x, which of the following does not result in zero?

The ______ of a tree is the number of nodes on the longest path from the root to a leaf.

a. height b. length c. depth d. balance

Referred to as the “infection vector”, the __________ is the means by which a virus spreads or propagates.

Fill in the blank(s) with the appropriate word(s).