How many of the following are correct with respect to baculoviruses? (1) They are pathogens that attack insects and other arthropods (2) The majority of baculoviruses used as biological control agents are in the family nucleopolyhedrovirus (3) These viruses are excellent candidates for species-specific, narrow spectrum insecticidal applications (4) They have been shown to have no negative impacts on plants, mammals, birds, fish or even on non-target insects