The mirror image of along the dotted line is

The correct answer is option 2: 

The dotted line is a vertical mirror line, so we take a left–right reflection.

Step 1: Reflect positions horizontally

In a vertical mirror:

• Left becomes right

• Right becomes left

• Top and bottom stay the same

Step 2: Reflect the elements

Original figure:

• Top-left: +

• Top-right: ● (black dot)

• Bottom-left: ○ (white circle)

• Bottom-right: +

• A diagonal line from bottom-left → top-right

After mirror reflection:

• Top-left + → Top-right +

• Top-right ● → Top-left ●

• Bottom-left ○ → Bottom-right ○

• Bottom-right + → Bottom-left +

The diagonal bottom-left → top-right becomes top-left → bottom-right after reflection.

Step 3: Match with options

The figure with:

• ● at top-left

• + at top-right

• + at bottom-left

• ○ at bottom-right

• diagonal from top-left to bottom-right

matches Option 2.