The following question is about workflow and reproducibility. Suppose you are writing a report with Rmarkdown that will be presented to an important client. You have a time consuming calculation that is required for downstream chunks for making tables and charts but that isn’t necessary to show the client.

Which of the following chunks will compute the output but not print the resulting code in the report? Note there may be more than one correct answer. Incorrect answers are penalised.

{r chunk-A, eval = FALSE, echo = FALSE}

{r chunk-B, eval = FALSE, echo = TRUE}

{r chunk-C, eval = TRUE, echo = FALSE}

{r chunk-D, include = FALSE}