Which of the following best exemplifies cooperative training?

a$.$ An e$-$learning program on corporate leadership in which trainees interact with the trainer and other trainees through a blog

b$.$ A community college program on solar panel installation partnering with a solar panel installation company that provides internships

c$.$ A medical school using simulations where the students can perform operations without harming real patients

d$.$ A training program in an IT firm wherein employees learn exclusively through informal interactions with their peers