Asuite of three production servers that were originally configured identically underwent the same vulnerability scans. however, recent results revealed the three servers has different critical vulnerabilities. the servers are not accessible by the internet, and av programs have not detected any malware. the servers' syslog files do not show any unusual traffic since they were installed and are physically isolated in an off-site datacenter. checksum testing of random executables does not reveal tampering. which of the following scenarios is most likely:
a. servers have not been scanned with the latest vulnerability signature. b. servers have been attacked by outsiders using zero-day vulnerabilities. c. servers were made by different manufacturers. d. servers have received different levels of attention during previous patch management events.

You need to design a circuit that implements the functions in the following table: s0 s1 function0 0 a + 10 1 a – b1 0 a + b1 1 a – 1s0 and s1 are 1-bit control inputs to select the function of the circuit. inputs a and b are 4-bitnumbers in 2s complement form. the output is also a 4-bit number in 2s complement form.you are allowed to use only one ttl 7483 4-bit adder to implement all the functions. but anynumber of other components (except the adder) can be used.hint: design a combinational logic circuit to modify the input b and the “carry input” of theadder depending on the control inputs s0 and s1.important: lab grade will depend on the working of the circuit & will be checked of by your labinstructor.1. is the output valid for the following input combinations: a. s0 = 0, s1 = 0, a = 7, b = 3? b. s0 = 0, s1 = 1, a = 7, b = 3? c. s0 = 1, s1 = 0, a = -4, b = -5? d. s0 = 1, s1 = 1, a = -8, b = 6? 2. what is the range of inputs (for both a and b) that will produce the valid output for all the functions?