Consider the following statements: 

(a) Both acids and bases change color of all indicators. 

(b) If an indicator gives a color change with an acid, it does not give a change with a base. 

(c) If an indicator changes color with a base, it does not change color with an acid. 

(d) Change of color in an acid and a base depends on the type of the indicator. 

Which of these statements are correct?