Which ABBA moment best defines their global pop peak from 1975-1979?

Global Pop Peak Era (1975-1979) poll options

Global Pop Peak Era (1975-1979)

ABBA's Global Pop Peak Era (1975-1979)

ABBA

• The glam rush of "Mamma Mia"
• The disco sparkle of "Dancing Queen"
• The drama and edge of "SOS"
• The polished pop of "Voulez-Vous"