For completely randomized design for k treatments and n observations, yif = response from the jth unit receiving ith treatment, ∑i ∑j yij = y.. and ∑jni yij = yi. . Which of the following options is correct?   1.       ∑k i=1∑ni j=1 (yij – yi)2 represents sum of squares of due to error 2.       ∑k i=1 (yi – y..)2 represents sum of squares due to treatments 3.       ∑k i=1∑ni j=1 (yij – y..)2 represents total sum of squares 4.       ∑k i=1 ni (yij – yi)2 represents sum of squares due to treatments