Consider the following statements.i. Runoff river plants can be located on any riverii. Runaway speed of a turbine is generally 180% of normal speediii. Underground power stations are suited to areas susceptible to landslidesiv. Higher the specific speed, higher will be the discharge and the headWhich of these statements are correct?

• A. i and ii
• B. ii and iii
• C. i and iv
• D. ii and iv