Which of the following is true for all integers aaa and bbb?
a≡b(modn)a \equiv b \pmod{n}a≡b(modn) implies a−ba - ba−b is a multiple of nnn
a≡b(modn)a \equiv b \pmod{n}a≡b(modn) implies a=ba = ba=b
a≡b(modn)a \equiv b \pmod{n}a≡b(modn) implies n=a−bn = a - bn=a−b
a≡b(modn)a \equiv b \pmod{n}a≡b(modn) implies a+ba + ba+b is a multiple of nnn