The open source movement has meant that there is a huge reusable code base available at __________________?

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The open source movement has meant that there is a huge reusable code base available at __________________?

A. free of cost
B. low cost
C. high cost
D. short period of time

Explanation: The open source movement has meant that there is a huge reusable code base available at low cost. This may be in the form of program libraries or entire applications.