What is reflexivity?

A$.$ A property of human language, but not animal communication systems, whereby language can be used to talk about itself.

B$.$ A property of human language, but not animal communication systems, whereby new forms can be created by combining existing ones.

C$.$ A property of human language, but not animal communication systems, making it possible to refer to things not present, and previous and past points in time.

D$.$ A property of both human language and some animal communication systems, whereby language can be used to talk about itself $.$

E$.$ A property of both human language and some animal communication systems, making it possible to refer to things not present, and previous and past points in time.

F$.$ All of the above

G$.$ None of the above