Answer: white hat hacker
Step-by-step explanation:
Like other forms of hacker, white hat hackers also have wide range of knowledge of breaking into systems, overriding firewalls, bypassing security protocols and can also do all other things hackers do. But what differentiates white hat hackers is the motive behind what they do, in that they carry out all this test not for their personal gain but for the benefit of the owners and also with the approval of the owners. Because after carrying out tests on the ways of exploiting the loop holes in the system they reveal it to the manufacturer or system owners for correction.