The measures of exposure values of options for this Chapter differ from the exposure value used for purposes of Chapter CA-4. The exposure value must be based on the change(s) in option prices that would result from a default of the respective underlying instrument. The exposure value for a simple long call option is its market value and for a short put option is the strike price of the option minus its market value. In cases involving short-call or long-put options, a default of the underlying would lead to a profit (i.e. a negative exposure) instead of a loss, resulting in an exposure of the option’s market value in the former case and equal the strike price of the option minus its market value in the latter case. The resulting positions will, in all cases, be aggregated with those from other exposures. After aggregation, negative net exposures must be set to zero.