How is the majority of client code in D2 authored?

A.
Using Java, the code is complied into an unobfuscated JavaScript “permutation” and delivered
to the browser in a single file.

B.
Using JavaScript, the code is compiled into an unobfuscated JavaScript “permutation” and
delivered to the browser in a single file.

C.
Using JavaScript, the code is compiled into an unobfuscated JavaScript “permutation” and
delivered to the browser as multiple files.

D.
Using Java, the code is complied into an obfuscated JavaScript “permutation” and delivered to
the browser in a single file.