A dual air brake system is best described as
A. Having two separate air brake systems that use a single set of brake controls
B. Having two separate air brake systems both systems of Supply Air to the trailer if there is none
C. Having two separate air brake systems each system has its own air tanks hoses lines Etc
D. Having two separate air brake systems a primary system in a secondary system
E. All of these
Answer: E. All of these
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