Scenario: A development team is tasked with building a high-security payment gateway. To ensure the codebase is resilient and maintainable over the long term, the lead architect mandates pair programming for all critical modules.场景：一个开发团队的任务是构建一个高安全性的支付网关。为了确保代码库长期具有弹性和可维护性，首席架构师要求所有关键模块都采用结对编程。How does this practice primarily contribute to the resilience of the codebase in this scenario?在这种情况下，这种做法主要如何提高代码库的弹性？单项选择题

a. 一个。By ensuring that only senior developers are responsible for writing critical security logic while others observe.通过确保只有高级开发人员负责编写关键安全逻辑，而其他开发人员则在一旁观察。

b. By fostering a shared understanding of the system and reducing the team's reliance on any single individual's expertise.通过培养对系统的共同理解，减少团队对任何单个个人专业知识的依赖。

c. By discouraging individual ownership so that no single developer feels accountable for the quality of the code.通过削弱个人所有权，使任何开发者都不必对代码质量负责。

d. By encouraging "code silos" where specific sections of the gateway are understood only by the pair that wrote them.通过鼓励“代码孤岛”，使得网关的特定部分只有编写它们的两人才能理解。