Bob wants to acquire a manufacturing plant. He hires Grace as his attorney to assist him in making the purchase. Grace suggests that Bob have an Environmental Study performed on the property because previous owners of the property operated the manufacturing plant and the manufacturing process resulted in hazardous by-products. Bob doesn't want to pay for the study. Which of the following is true? O Bob should pay for the Environmental Study. Although he has no reason to know that hazardous substances were disposed of on the property, he could still be liable for clean up costs under CERCLA because current owners or operators of a site can be potentially responsible parties under CERCLA. O Bob shouldn't pay for the Environmental Study. The current owners or operators of a site are not potentially responsible parties under CERCLA. O Bob shouldn't pay for the Environmental Study. Only those who actually improperly dispose of hazardous substances can be held liable as potentially responsible parties under CERCLA