In the event of any of the following developments, OFHEO shall undertake one of the supervisory responses enumerated in § 1777.11, or a combination thereof:

(a) OFHEO's national House Price Index (HPI) for the most recent quarter is more than two percent less than the national HPI four quarters previously, or for any Census Division or Divisions in which are located properties securing more than 25 percent of single-family mortgages owned or securing securities guaranteed by an enterprise, the HPI for the most recent quarter for such Division or Divisions is more than five percent less than the HPI for that Division or Divisions four quarters previously;

(b) An Enterprise's publicly reported net income for the most recent calendar quarter is less than one-half of its average quarterly net income for any four-quarter period during the prior eight quarters;

(c) An Enterprise's publicly reported net interest margin (NIM) for the most recent quarter is less than one-half of its average NIM for any four-quarter period during the prior eight quarters;

(d) For single-family mortgage loans owned or securities by an Enterprise that are delinquent ninety days or more or in foreclosure, the proportion of such loans in the most recent quarter has increased more than one percentage point compared to the lowest proportion of such loans in any of the prior four quarters; or

(e) Any other development, including conduct of an activity by an Enterprise, that OFHEO determines in its discretion presents a risk to the safety and soundness of the Enterprise or a possible violation of applicable law, regulation, or order.