In a class, 30% of the students speaks truth, 20% speaks lie and 10% speaks both. If a student is selected at random, what is the probability that he has speak truth or lie?	Options.
A) 1 / 4 B) 2 / 3 C) 3 / 5 D) 2 / 5 E) 2 / 7

Rationale: d ) 2 / 5
Answer: D