Jenkins worked as an operator of a drilling machine for Seamless Construction Company. One day, he used the drilling machine in a negligent manner which was in direct violation of Seamless's safety manual, and injured himself. Seamless claims it is not liable for Jenkins' injury because his injury resulted from his: (a) gross negligence, (b) disobedience of the safety manual, and (c) written waiver of liability. It is possible for Jenkins to recover for his injury? Please explain.