OOAD principle refers to Object-oriented Analysis and Design that operate on the open-closed principle. It is based on the objects model.
The major elements are the factors which if not found within the model cannot be classified as Object-oriented. The minor elements are important but not crucial aspects of the design.
Since the options are not provided, look through the provided elements to identify the OOAD principles.
Toddlers are most likely to become more curious and would want to start wondering from your presence but nothing will change between you too just that he/she will start becoming more active but the real shins hip will change if the child is scared of you.
