Buying Items

When you buy items in game, which way should you do it?

A. -Long Sword x4 -Armor (or MR) -Boots -Then start buy stuff that is about 1k gold, then after 6 of those, build your final items.

B. -Focus on building one item and one item at a time. -So BoRK, then BloodThirster, Then Guardian Angel, Ravenous Hydra, etc.

C. -Focus on cheap items first, then late game sell it for expensive items. Example: -Sanguine Blade, Dervish Blade, Phantom Dancer, Mortal Reminder, Sterak's Gage, Statikk Shivv. Then late game sell the stuff you dont want like Sanguine Blade for an expensive item.