When using Run All to execute all cells in an ArcGIS notebook, what is a common cause of invalid string syntax errors?

The correct answer indicates that cells that contain Markdown code must be correctly identified as having a code cell type for the notebook to run without encountering invalid string syntax errors. In an ArcGIS notebook, cells can be designated as either code or Markdown. When executing all cells, the notebook expects the content to be properly formatted according to its cell type.

If a cell containing Markdown code is mistakenly set as a code cell, the interpreter will not recognize the Markdown formatting, leading to syntax errors. This situation arises because the notebook is trying to execute Markdown text as if it were a code instruction, which results in invalid syntax being flagged by the parser.

The other options highlight potential misunderstandings about cell types, but they do not directly address the issue of invalid string syntax errors caused by incorrectly assigned cell types. This underscores the importance of correct classification within an ArcGIS notebook, ensuring that each cell is properly set to either code or Markdown to prevent execution errors.