technician a says a refrigerant identifier is only needed when the technician is unsure of the refrigerant used in an ac system. technician b says that some refrigerant identifiers can measure the amount of moisture in the refrigerant system to aid in diagnosis. who is  correct?  
a.  technician a   
b.  technician b   
c.  both technicians a and b   
d.  neither technicians a nor b

Victor is concerned about his constant impulsive tendencies. he thinks something must be wrong with him. what is a healthy action victor could take? take some of his friend's add medication to see if it . follow what his friend tells him he needs to do to solve his feelings. listen to a mental health professional who can guide him through his troubles. diagnose himself and take some natural supplements.