Solution

The core responsibility of a data analyst is to analyze data and extract actionable insights that help guide business decisions. They often work with data sets, clean and organize data, perform exploratory data analysis (EDA), and then interpret and present findings to stakeholders through reports or visualizations. Unlike data scientists or data engineers, data analysts typically focus on interpreting data rather than building complex algorithms or designing data systems. Their role is crucial in understanding trends and patterns within the data, which can lead to more informed strategic decisions. Option A is incorrect because developing complex machine learning algorithms is generally the role of a data scientist rather than a data analyst. While data analysts may work with machine learning models in some organizations, this is not their primary role. Option B is incorrect as designing data architecture and maintaining databases falls under the scope of a data engineer, not a data analyst. Option D is incorrect because creating visualization tools is often the role of a software developer or data visualization expert, whereas data analysts use these tools to present data. Option E is incorrect as managing IT infrastructure and network security is more aligned with IT roles, not data analysis.