Who can initiate an optional referendum at the national level?

Constitution ofVenezuela (1999)

http://venezuelanalysis.com/constitution/

Article 71: Matters of special nationaltranscendence may be referred to a consultative referendum, on the initiativeof the President of the Republic, taken at a meeting of the Cabinet; byresolution of the National Assembly, passed by a majority vote; or at therequest of a number of voters constituting at least 10% of all votersregistered on the national, civil and electoral registry.

Matters of special state, municipal and parishtranscendence may also be referred to a consultative referendum. The initiativeshall be taken by the Parish Board, the Municipal Council and to theLegislative Council, by the vote of two third of its members; by the Mayor andthe Governor or by a number of voters constituting at least 10% of the totalnumber of voters registered in the pertinent circumscription.