Considered the following statements about the characteristics of contours -

(1) Closed contour lines with higher values inside show a lake,

(2) Contour is an imaginary line joining points of equal elevations,

(3) Closely spaced contour lines indicate a steep slope.

(4) Contour lines of equal height may not converge nor continue as one line but a single contour line may split into two lines

Which of the statements given above are correct?