Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) The value of a for which all extremum of functino `f(x) = x^3 – 3ax^2 + 3(a^2 –1)x + 1` lie in the interval (2, 4) is – - Sarthaks eConnect

The value of a for which all extremum of functino `f(x) = x^3 – 3ax^2 + 3(a^2 –1)x + 1` lie in the interval (2, 4) is :–

(3, 4)

(–1, 3)

(–3, –1)

None of these