An intern has joined a development team for the summer. While doing the final performance review for the intern, the project manager noted that the code that the intern worked on used consistent naming and appropriate comments to help identify what the code does.

The project manager is impressed and would like to bring the intern back because they practiced what? Select the best answer.

a$.)$

Optimized website performance

b$.)$

Maintained clean and consistent code

c$.)$

Performed browser caching

d$.)$

Invoked cross$-$site scripting