Pollution-free vegetables refer to vegetables that use microbial pesticides, agricultural antibiotics, and other biological control measures and highly effective, low-toxicity, and low-residue chemical pesticides to comprehensively prevent and control vegetable diseases and insect pests, so that the pesticide residues are lower than the nationally permitted eating standards. Based on the above definition, which of the following is correct in the following options? ['Pollution-free vegetables must use microbial pesticides.', 'Allowed use of agricultural antibiotics.', 'Chemical pesticides can be used as long as they are highly effective and low toxic.', 'Pollution-free vegetables can be eaten with confidence and will not cause any harm to the body.']