How many lines do the Intelligent Chassis Management Bus (ICMB) use to connect all system devices together?

A.
One line.

B.
Two lines.

C.
Three lines.

D.
Four lines.

Explanation:
The ICMB uses two lines to connect all system devices together. The ICMB is based on the Philips I2C bus specification. The specification is also referred to as the Inter-IC bus.
The Philips I2C bus specification uses two lines to connect system devices.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 421-422.