Jennifer, Dev, Gabriel and Manpreet are working together to develop a marketing plan for one of their company's newest product lines. After some initial conflict, the group started to really come together. Now, the group is highly unified and very productive. The marketing plan is practically writing itself! Which stage of development is this group in$?$

a$.$

adjourning

b$.$

performing

c$.$

norming

d$.$

forming

e$.$

storming