Answer:
a public company
Step-by-step explanation:
The company, Alexco where Joy was hired was a public company. Joy received 20 shares of Alexco stock as signing bonus.
A public company is one which sells its own registered shares or stocks to the public in general. Whereas a private company sells its shares only to the willing investors. In public company, the equities are traded by the normal public. Their shares are widely distributed.
Thus the company where Joy joined is a public company.