You are a solutions architect working for a cosmetics company. your company has a busy magento online store that consists of a two-tier architecture. the web servers are behind an auto scaling group and the database is on a large msql instance. your store is having a black friday sale at the end of the week, and having reviewed the performance for the last sale you expect the site to start running very slowly during the peak load. you investigate and you determine that the database was struggling to keep up with the number of reads that the store was generating. how can you successfully scale this environment out so as to increase the speed of the site?