Wave Motors Inc., a Kempa$-$based automobile company, has entered into a partnership with Sphere Autos Inc., headquartered in United Cadvia. The parent companies, together, have established a stand$-$alone firm called Genuine Autos Inc. This arrangement best exemplifies a

a$.$

joint venture.

b$.$

proprietorship.

c$.$

non$-$equity alliance.

d$.$

partnership.