a) kernel is the program that constitutes the central core of the operating system
b) kernel remains in the memory during the entire computer session
c) kernel is made of various modules which can not be loaded in running operating system
d) kernel is the first part of operating system to load into memory during booting

Answer: c
Explanation: Kernel is the first program which is loaded in memory when OS is loading as well as it remains in memory till OS is running. Kernel is the core part of the OS which is responsible for managing resources, allowing multiple processes to use the resources and provide services to various processes. Kernel modules can be loaded and unloaded in run-time i.e. in running OS.