INSTALL: Grammar advice?

[Nathan Hartman]

In INSTALL, there is this awkward use of (optionally):

        The Netwide Assembler (NASM) is used to build the (optionally)
        assembler modules of OpenSSL.

Which of these is the best fix?

(1)     The Netwide Assembler (NASM) is used to (optionally) build the
        assembler modules of OpenSSL.

(2)     The Netwide Assembler (NASM) is (optionally) used to build the
        assembler modules of OpenSSL.

(3)     The Netwide Assembler (NASM) is used to build the (optional)
        assembler modules of OpenSSL.

Thanks!
Nathan