What is the expanded form of this number?



15.306



1.(1×10)+(5×1)+(3×110)+(6×1100)



2.(1×10)+(5×1)+(3×1100)+(6×11,000)



3.(1×10)+(5×1)+(3×110)+(6×11,000)



4.(1×10)+(5×1)+(3×1100)+(6×1100)