Answer:
A. Source code
Step-by-step explanation:
In the field of Programming; Source code is the code written in high level language given to the computer to translate to machine - executable code before executing. It is usually written and understood by human. It is closer to human like language, as it allows easier expression. It is mostly consist of english-like statement.
So, Erik would primarily be writing source code when performing his daily tasks since his daily task require high level of computer programming and internet knowledge.