D

A

C

B

Because \label must always be the last command in an environment.

To link the label to the image (mesh) instead of the caption.

To ensure \ref refers to the figure's number. If placed before, it might refer to the section number.

It's just a style choice; the order doesn't matter.

D

A

C

B

A

C

B

The answer is \math{5}.

The answer is 5.

The answer is $5$.

\item The answer is 5.

Traiter P1 comme un problème de clustering, P2 comme un problème de classification

Traiter les deux problèmes comme des problèmes de clustering

Traiter P1 comme un problème de classification, P2 comme un problème de clustering.​

Traitez les deux comme des problèmes de classification.​

D

A

C

E

B

\label and \pageref

\caption and \ref

\includegraphics and \caption

\usepackage and \includegraphics