What is the primary symbolic significance of the 70 'sevens' prophecy in Daniel 9:24-27 concerning Jerusalem and the Messiah?

A A literal countdown of 70 weeks until the destruction of the second temple. B A symbolic timeframe pointing towards the coming of the Messiah and the establishment of God's kingdom, encompassing both historical and eschatological events. C A calculation predicting the exact date of the end of the world. D A metaphor for the continuous cycle of sin and redemption in Israel's history.