Lets talk about the difference between both the technology Switch Stacking uses proprietary cabling and is limited in distance while in the case of Cisco VSS, It uses 10 GE interfaces and so it can be geographically separated In the case of stacking, no configuration required if switch supports stacking while in the case of Cisco VSS concept, you need to configure about the VSS and VSL on the switches. You can have stack upto 9 switches via stack cabling, while in the Cisco VSS, only two switches can be the part of VSS. For Cisco portfolio, Cisco switches like 2960 or 3750,3850 will be the part of the cisco stack switching while Cisco 4500 catalysts, Cisco 6500 and Cisco 6800 catalysts are using the concept of Cisco VSS. Another thing like Cisco stack switching generally used at Access layer while Cisco VSS can be used at distribution or core layers.

Provided answer is correct

Provided answer is correct

VSS can be used on 2 devices and is both supported on 4500 and 6500 cat switches they can be in different locations

Reference: https://community.cisco.com/t5/switching/vss-vs-stackwise-vs-vpc/td-p/2586871

given answers is correct

given answers is correct