Which of the following statements are true , and which are false ? ( a ) If a - 6 ( mod m ) , and if c - d ( mod m ) , where a b c d and mare integers , with m > 2 then a - c = 6 - d ( mod m ) True False Don't know ! ( b ) fac - be ( mod m ) , where a b c , and mare integers , with m > 2 , then a - 6 ( mod m ) False True Don't know ! ( c ) If n m and a - 6 ( mod m ) , then a - 6 ( mod n ) , where n and mare positive integers POSITIT greater than True False Don't know