Which is the method by which ads are displayed on most sites:<BR>1. randomly from the pool of ads to all page viewers<BR><BR>2. cycling through all ads, one at at time to each successive page view regardless of viewer (so that each page view will generate the next ad, but that a single viewer will simply see the ad that is next up, but might not see all ads).<BR><BR>3. cycling through all ads, one at a time to each session/viewer(so that each viewer will see the cycle of ads in order)<BR>