Statement 2 has $k$ and $a$ swapped; statements 1 and 3 are true — no option says so

Consider the statements about BIBD$(a,b,k,r,\lambda)$: (1) If $a=b$, the design is said to be symmetric; (2) $\lambda(k-1)=r(a-1)$; (3) The adjusted treatment sum of squares is free from block effects. Which of the above are correct?