Amendments to this Charter may be framed and proposed:
a. In the manner provided by law, or
c. By the voters of the City, when any 50 qualified voters initiate proceedings to amend the Charter by filing with the finance officer an affidavit stating they will constitute the petitioners' committee and be responsible for circulating the petition and filing it in proper form, stating their names and addresses and specifying the address to which all notices to the committee are to be sent, and setting out in full the proposed Charter amendment. Promptly after the affidavit of the petitioners’ committee is filed, the clerk shall issue the appropriate petition blanks to the petitioners’ committee. The petitions shall contain or have attached thereto throughout their circulation the full text of the proposed Charter amendment and must be signed by registered voters of the City in the number of at least ten (10%) percent of those individuals actually voting in the City in the preceding gubernatorial election.