Select all that apply

Which of these sentences represents EExP$(x),$ where $P(x)$ is the statement that $x$ has more than $1$ GB RAM and the domain is all the computers at a university?

All the computers at the university have more than $1$ GB RAM.

There is at least one computer at the university with more than $1$ GB RAM.

There is a computer at the university that has more than $1$ GB RAM.

Some of the computers at the university have more than $1$ GB RAM.