Using Compound Entities allows us to... Select one: a. Check the valid/invalid state of multiple entities at once b. Program multiple actions to happen at once

Analyzing the Options

1. Option A: Check the valid/invalid state of multiple entities at once

   • Analysis: Compound entities can encapsulate multiple entities and provide a means to evaluate their states collectively. This option implies that you can assess whether groups of entities meet certain conditions simultaneously, which is a valid advantage of using compound entities.

2. Option B: Program multiple actions to happen at once

   • Analysis: This option suggests that compound entities can facilitate the execution of various actions concurrently. While it is possible in certain contexts, the core function of compound entities is more about status checks rather than executing simultaneous operations.

Conclusion

In light of the analysis, the more accurate choice regarding the primary ability of compound entities is:

Final Answer

a. Check the valid/invalid state of multiple entities at once