Rohan thinks he knows how to bisect angles and follows following steps to construct \[45{}^\circ \]angle. Step 1: Construct an angle of \[90{}^\circ .\] Step 2: Bisect the \[90{}^\circ \] angle. Step 3: Bisect one of the angles obtained in step 2. Which steps is not required to construct a \[45{}^\circ \]angle?

• A.  Step 1                        
• B.  Step 2         
• C.  Step 3         
• D.  Step 2 and 3