An electrician created a new tool to prevent electrocution. The patent was filed in May $2020.$ When the electrician passes away $20$ years later, the son tries to prevent a competitor from entering the market with a similar product. Why will the son not be successful?

a$.$ The son did not inherit the patent.

b$.$ The patent only has a $15-$year term.

c$.$ The son does not have ownership rights of the patent.

d$.$ The son is not the inventor.