The verb 'leverage' means 'to use something to the maximum advantage'. It must ideally be followed by a noun which is the subject used for advantage. The given sentence uses the preposition 'around' which is not correct. Option (1) is also incorrect because it unnecessarily uses the preposition 'about'. Option (3) is incorrect because it is grammatically incorrect. The tense to be used is simple past tense. Option (2) is correct because it does not use a preposition and makes use of the simple past tense. The correct sentence is, 'Charlie leveraged his programming skills to secure a software job'. Hence the correct answer is option 2.