What could you have done differently to reduce the total costs? $($Select the best answer below.$)$

A$.$ Costs could have been reduced by placing both trades online with a request for routing to the NYSE where the chance of crossing with other public orders is greatest. Had no market maker been necessary, total costs would have been only the $$25$ Schwab commission per trade.

B$.$ Costs could have been reduced by placing both trades online with a request for routing to the NYSE where the chance of crossing with other public orders is greatest. Had no market maker been necessary, total costs would have been only the $$4\mathrm{.}95$ Schwab commission per trade.

C$.$ Costs could have been reduced by placing both trades online with a request for routing to the NYSE where the chance of crossing with other public orders is greatest. Had no market maker been necessary, total costs would have been only the $$29\mathrm{.}95$ Schwab commission per trade.

D$.$ Costs could have been reduced by placing both trades with a market maker. Had no online trades been necessary, total costs would have been only the $$4\mathrm{.}95$ trade.