Which are the dependent and independent variables in this model?

#1
Hi, everyone, I am reading some literature now, and I need to do a research with Structural Equation Modeling(SEM); however, unlike normal research model, which only involved with one independent variable(A), one dependent variable (B) or plus one mediation variable (C), like A>B>C. there are always lots of variable in a SEM. I am wondering how do I know which variable in the SME model is independent variable, and which are the dependent variables in a SEM model below.
 
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