What Is the Difference Between the Inurl: and the Allinurl

What is the difference between the inurl: and the allinurl: operators?

A) Using inurl: is like a logical OR and using allinurl: is like a logical AND
B) There is no difference, the allinurl is not listed on the help page because it has been discontinued
C) With inurl: only the first keyword must be in the URL and additional keywords can be anywhere on the page. The allinurl: operator means all of the keywords must be in the URL.
D) With inurl: only the first keyword must be in the URL and additional keywords can be anywhere on the page. The allinurl: operator means any of the keywords must be in the URL.