You notice that the price of ultrapure water rises 8%, the demand for chip grade silicon declines 2%.

Which is true:

• Chip grade is a complement to Ultrapure water with a cross-price elasticity of -0.25
• Chip grade silicon is a substitute to ultra pure water with a cross-price elasticity of -4
• Chip grade silicon is a substitute to ultra pure water with a cross-price elasticity of +4
• Chip grade silicon is a complement to ultra pure water with a cross-price elasticity of +0,25