Physicists are the only scientists who theorize about the nature of time, and Stephen Hawking certainly does

Question:

Physicists are the only scientists who theorize about the nature of time, and Stephen Hawking certainly does that. Therefore, Stephen Hawking must be a physicist.

Translate the following arguments into standard-form categorical syllogisms, then use Venn diagrams or the rules for syllogisms to determine whether each is valid or invalid. See Section 4.7 for help with the translation.

Rules of Syllogisms From Section 4.7:

Figure I AAA EAE All EIO Figure I AAI EAO Unconditionally Valid Forms Figure 2 Figure 3 EAE IAI All OAO EIO