The Porch of the Maidens on the Erechtheion is supported by __________

Which is the correct chronological sequence of these works by Michelangelo?

a. Rondanini Pietà; the Rome Pietà; David; the Sistine ceiling b. David; the Rome Pietà; the Sistine ceiling; Rondanini Pietà c. the Rome Pietà; David; the Sistine ceiling; Rondanini Pietà d. the Rome Pietà; the Sistine ceiling; David; Rondanini Pietà

As it relates to music of the Classical era, a refrain may be thought of as:

a) a cadenza-like insertion at the end of a movement b) the main theme in a rondo movement c) the trio section of a Minuet's larger second section d) the slow introduction to a symphony