What are the three divisions of the male urethra?
1) Prostatic urethra, membranous urethra, spongy (penile) urethra
2) Prostatic urethra, bulbous urethra, spongy (penile) urethra
3) Prostatic urethra, membranous urethra, cavernous urethra
4) Prostatic urethra, bulbous urethra, cavernous urethra