Which colour pen to answer?

Dear Friends,

According to point no .25 in instructions given along with the admit card , Candiates should write the answers only in blue or black ink and no other colour.

But in VIJAYAWADA centre invisilator read out the instructions given by institute in the exam hall, in that one of the instruction is

"Candidate should use BLUE ONLY for ansewring the questions."

What is the position of the students who used BLACK  pen?