30 points!

The work of a student to find the dimensions of a rectangle of area 8 + 12x and width 4 is shown below:

Step 1: 8 + 12x

Step 2: 4(4) + 4(8x)

Step 3: 4(4 + 8x)

Step 4: Dimensions of the rectangle are 4 and 4 + 8x

In which step did the student first make an error and what is the correct step? Step 2; 4(2) + 4x(2)

Step 2; 4(2) + 4(3x)

Step 3; 4 + (4 + 8x)

Step 3; 4 + (4 ⋅ 8x)