Assertion (A): Dynamic loading defers the loading of a program routine or module into memory until it is explicitly called during execution.
Reason (R): Dynamic linking delays the actual linking of system libraries until execution time, allowing multiple running programs to share a single copy of library code.
Assertion (A) is True: Dynamic loading is a mechanism where a routine/module is loaded into main memory only when it is actually called during the execution of the program. This helps in efficient memory utilization, especially for infrequently used code (like error-handling routines).
Reason (R) is True: Dynamic linking is a concept where the linking of system libraries (like DLLs or shared libraries) is postponed until execution time. This allows shared libraries to be stored once in memory and used by multiple programs simultaneously, saving both disk space and memory.
Relationship between Assertion and Reason: Although both statements are individually true facts related to memory management in operating systems, Reason (R) explains dynamic linking, whereas Assertion (A) is about dynamic loading. Dynamic loading focuses on loading routines into memory on demand, while dynamic linking focuses on linking shared library modules at runtime. Therefore, Reason (R) is not the correct explanation for Assertion (A).