All of the following are true except:
A)A passive activity includes any rental activity or any trade or business in which the taxpayer does not materially participate.
B)Medical expenses incurred on behalf of children of divorced parents are deductible only by the custodial parent, regardless of which parent pays the expenses.
C)A taxpayer may deduct suspended losses of a passive activity when the taxpayer completely terminates his or her ownership of the activity if the activity was not grouped with any other activity.
D)Taxpayers may not deduct interest expense on most personal debt, including credit card debt, car loans, and other consumer debt.
et M= . find c1 and c2 such that m² c1m c2i2=0, where i2 is the identity 2x2 matrix and 0 is the zero matrix of appriopriate dimension.