Two main measures for the efficiency of an algorithm area.Complexity and Spaceb.Data and Spacec.Time and Spaced.Processor and Memory

The correct answer is c. Time and Space.

Explanation:

1. Complexity generally refers to how the computational resources used by an algorithm grow with the size of the input. This includes both:

   • Time Complexity: A measure of the time an algorithm takes to complete as a function of the length of the input.
   • Space Complexity: A measure of the amount of memory space required by the algorithm as a function of the length of the input.

2. Data and Space is not a standard measure of algorithm efficiency. While data is important for algorithms, it does not directly categorize efficiency.

3. Processor and Memory are hardware-related terms and do not directly reflect algorithmic efficiency.

Thus, the measures commonly used to assess algorithm efficiency are time and space, making option c the accurate choice.