For a system with complex business rules and many branches, decision testing (a white-box technique) is appropriate because it ensures that each decision point (branch) in the code is tested. Equivalence partitioning (a black-box technique) complements this by ensuring that all functional areas (based ondifferent inputs) are adequately tested. This combination provides thorough coverage of both the internal logic and the functional requirements of the system.

Topic 7, Scenario 7 "Test Estimation"
You have been contracted to manage the acceptance testing of a new computer-based reservation system for a travel agency. You have provided an approximate budget estimate for the testing project based on previous experience with similar sized projects. However, the management of the parent company of the travel agency will not commit to the budget until detailed cost estimates are provided.
The reservation system is being developed by a third party However, detailed specifications of the software are available, as well as an estimate of the total effort that will be spent in developing the software. The software is to be delivered in four increments, and the functionality to be delivered in each increment has already been agreed on.

McCabe's Cyclomatic Complexity is a metric used to measure the complexity of a program. It is calculated using the formula:
Cyclomatic Complexity=EN+2P\text{Cyclomatic Complexity} = E - N + 2PCyclomatic Complexity=EN+2P where:
* E = number of edges in the flow graph
* N = number of nodes in the flow graph
* P = number of connected components (usually 1 for a single program)
In the given program, there are 2 decision points (IF and THEN). The cyclomatic complexity is calculated as:
Cyclomatic Complexity=21+2=3\text{Cyclomatic Complexity} = 2 - 1 + 2 =
3Cyclomatic Complexity=21+2=3
Hence, the answer is B. Reference: ISTQB CTFL Syllabus V4.0, Section 4.3.2.