The correct answer is: C. Army
Army is a non-standard version of the programming language PL/1. It was developed by the United States Army in the 1960s and was used for a variety of applications, including logistics, training, and simulation. Army is no longer in use, but it is still of interest to historians and computer scientists.
PROLOG is a logic programming language that was developed in the 1970s. It is used for a variety of applications, including artificial intelligence, natural language processing, and database management.
APL is a functional programming language that was developed in the 1960s. It is used for a variety of applications, including scientific computing, financial analysis, and data visualization.
PL/1 is a general-purpose programming language that was developed in the 1960s. It is used for a variety of applications, including business applications, scientific computing, and systems programming.
None of the above is a non-standard version of a computing language.