Given the Following Syllogism

Multiple Choice

Given the following syllogism:
All unicorns are horses.

This syllogism is:

A) Valid from the Aristotelian standpoint only.
B) Invalid from both the Boolean and the Aristotelian standpoints.
C) Valid from the Boolean standpoint only.
D) Valid from both the Boolean and the Aristotelian standpoints.
E) Conditionally valid from the Aristotelian standpoint.