The teacher instructed three students ‘A’, ‘B’ and ‘C’ respectively to prepare a $50\%$ (mass by volume) solution of sodium hydroxide ($\mathit{NaOH}$). ‘A’ dissolved $50\mathit{ g}$ of $\mathit{NaOH}$ in $100\mathit{ mL}$ of water, ‘B’ dissolved $50\mathit{ g}$ of $\mathit{NaOH}$ in $100\mathit{ g}$ of water ‘C’ dissolved $50\mathit{ g}$ of $\mathit{NaOH}$ in water to make $100\mathit{ mL}$ solution. Which of the following have made the desired solution?