Martin Corporation purchased land in 2007 for $290,000. In 2015, it purchased a nearly identical parcel of land for $460,000. In its 2015 balance sheet, Martin valued these two parcels of land at a combined value of $920,000. By reporting the land in this manner, Martin Corp. has violated the O a) historical cost principle b) convergence c) economic entity assumption 3 d) monetary unit assumption