Which choice shows the best way to join two independent clauses with a semicolon?

My brother is a computer whiz; I can barely type my name.

While my brother plays on his computer; I like to paint.

My brother is a computer whiz; but I am not.

My brother knows a lot about computers; more than I do.

Question

Which choice shows the best way to join two independent clauses with a semicolon?
	
My brother is a computer whiz; I can barely type my name.
	
While my brother plays on his computer; I like to paint.
	
My brother is a computer whiz; but I am not.
	
My brother knows a lot about computers; more than I do.

Mercury · Answer

major hint: both sides of the semicolon should have complete sentences. for example, the last one doesn't work because "more than I do" is not a complete sentence.