What Was Archaeological Investigation of the Battlefield at Little Bighorn

What was archaeological investigation of the battlefield at Little Bighorn able to conclude about the nature of the battle?

A) Virtually no evidence of formal tactics such as skirmish lines, supporting Indian accounts of chaos and hand- to-hand fighting.
B) Evidence of abundant skirmish lines, supporting settler accounts of Custer and his men fighting in a calm and controlled manner.
C) Custer's personal movements could be tracked by the presence of brass cartridges, as he had the only weapon on the battlefield that used them; his movements indicate that he maintained control of the battle until his death.
D) The battle lasted for days, with control of the battle switching frequently from Custer's army to the Indians, and back again before Custer's troops were finally completely subdued.