<Tr> <Th> Hierarchy of hazard controls </Th> </Tr> <Tr> <Td> <Ul> <Li> Elimination </Li> <Li> Substitution </Li> <Li> Engineering controls </Li> <Li> Administrative controls </Li> <Li> Personal protective equipment </Li> </Ul> </Td> </Tr> <Ul> <Li> Elimination </Li> <Li> Substitution </Li> <Li> Engineering controls </Li> <Li> Administrative controls </Li> <Li> Personal protective equipment </Li> </Ul> <Li> Personal protective equipment </Li>

According to the hierarchy of controls which of the following is least likely to fail