Jordan has been asked to help his company find a way to allow all the workers to log on to computers securely but without using a user name and password. The CIO wants everyone use face recognition software. What peripheral will be needed on each computer to allow the workers to log on using face recognition software

Acomputer has a two-level cache. suppose that 60% of the memory references hit on the first level cache, 35% hit on the second level, and 5% miss. the access times are 5 nsec, 15 nsec, and 60 nsec, respectively, where the times for the level 2 cache and memory start counting at the moment it is known that they are needed (e.g., a level 2 cache access does not even start until the level 1 cache miss occurs). what is the average access time?