A Human Resources (HR) firm finds that a new service has entered the market which helps employees in the workplace find quick automated answers to most of their questions. The claim of the producers of this new service is that it will complement Human Resource functions rather than substitute them. Which of the following will help the HR firm determine that this is indeed a complement? a) The cross-price elasticity is negative b) The income elasticity is negative c) The cross-price elasticity is positive and less than one d) The cross-price elasticity is positive and greater than one