$9\mathrm{.}11$ Answer the following multiple$-$choice questions.

A hacker from Croatia inserted a malicious string of code in a popular news website's database. When a researcher from a financial institution requested a page from the website, it was sent along with the malicious string. The researcher's browser executed the string inside the response and sent the researcher's cookies to the hacker. The hacker used the cookies to impersonate the researcher. What computer fraud approach did the hacker use to obtain the cookies?

a$.$ man$-$in$-$the middle attack

b$.$ cross$-$site scripting attack

c$.$ hijacking attack

d$.$ buffer overflow attack

e$.$ impersonation