Which marketing strategy was most prominently used to promote War Bonds during World War II?

During World War II, governments needed to finance their military operations on an unprecedented scale. Beyond taxation, war bonds became a crucial funding mechanism and an innovative marketing campaign that merged patriotism with financial investment. This poll tests your knowledge about one of history's most successful product marketing strategies that helped fund a global conflict.

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Celebrity endorsements from Hollywood stars who traveled on 'Bond Tours'
Early television advertising campaigns featuring combat footage
Door-to-door sales by veterans wearing their military uniforms
Discount coupons included with every bond purchase to boost repeat sales