What of following of products have a cross-price elasticity of negative demand ?

What of following of products have a cross-price elasticity of negative demand ?

  1. High-speed internet access and an online streaming service for TV shows
  2. Jelly and jam
  3. Dishwashers and houseplants
  4. Pens and pads of paper
  5. A Porsche 911 and a BMW i8
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