(c) (25 points) Platform Pricing The demand function by a social media platform user is denoted as -n(pA,a). pA is the one-shot registry fee charged by the platform. a. is the number of afliated advertisers. Each advertiser is assumed to put one unit of ads on the social media platform. so the number of advertiser represents the amount of ads on the platform. n is the number of users who register in the social media platform. Assume that 66?": 0 and 88}; O and g