Final answer:
The simplest way to use the System method is likely related to displaying system information. Bulletin board systems from the 1980s exemplify early ways to interact with and display system information, which relates to today's use of system methods to provide detailed information. Option number C is correct.
Step-by-step explanation:
The simplest way to use the System method is often associated with displaying system information or controlling computer peripherals. However, based on the context provided and the options listed for the System method usage, option (c) 'To display system information' appears to be the most relevant answer. This is because bulletin board systems like the one mentioned, which were used in the 1980s, were one of the early ways users interacted with systems to display and exchange information.
Today, more sophisticated systems provide detailed system information through various system methods.
As per the second set of options, when discussing the transfer of energy in thermodynamics, the correct answer would depend on what is being asked. For instance, (a) 'the work done on the system' and (b) 'the work done by the system' relate to mechanical work, whereas (c) 'the heat into the system' and (d) 'the heat out of the system' relate to thermal energy transfer. Depending on the specifics of the system's operation, the correct choice could vary.