Hey student! =)

Great question!

Prospective just means potential/possible, so there could be many prospective web designers that a company can hire.

There could be a prospective web designer who is a great communicator

A prospective web designer who specializes in color

And so on...

But even if you didn't know the meaning of prospective, think about essential vs nonessential relative clauses in the following way:

1. If the relative clause specifies the type of noun  --> essential is correct

ex.

biology students who take diligent notes will do well on the test.

a poor student who lives in a rough neighborhood might face many struggles.

a successful tech company that treats its employees well is a great place to work at.

In all of these examples, the relative clause is essential because it clarifies the type of noun. Since there can be many types of biology students, many types of poor students, and many types of successful tech companies, the relative clause is essential since it helps to clarify/specify the noun.

2. If the relative clause is used after a noun that refers to only one person/thing --> nonessential is correct

​

ex.

The company hired Mary, who has a deep understanding of the company's needs.

"The Hobbit," which is a movie about the adventures of a little people, performed poorly at the box office.

In these examples, the relative cluase is not specifying the "type" of noun, right? Instead, it is simply providing additional information about ONE noun (Mary can only refer to one person... "The Hobbit" can only refer to one thing).

Hope that helps!!

Keep moving forward!