Physics - Electricity - Circuits - Series and parallel circuits - Christmas Lights Problem

Present two scenarios: 'String A: When one bulb burns out, ALL the others go out. String B: When one bulb burns out, the others stay lit.' Ask: 'Which is series and which is parallel?' (A=series, B=parallel). Then: 'Which is better for home wiring? Why?' (Parallel - one device failing doesn't affect