Before entering upon the duties of their offices, the members of council shall take and subscribe an oath or affirmation of office under 53 Pa.C.S. § 1141 (relating to form of oaths of office). The oath or affirmation may be taken before any judge or magisterial district judge of the county, a notary public or the mayor of the borough when the individual has qualified, and the oath or affirmation shall be filed with the borough secretary and preserved among the records of the borough for a period of six years.