Salesforce is well known for embedding its employees in the company's Ohana Culture, which motivates them and encourages valuable collaborations. This culture is a significant source of competitive advantage for the company, but company culture can also become weaker over time if the company's leaders and human resource practices do not prioritize and tend to it (the culture). This type of challenge for sustaining a competitive advantage is typically referred to as a/an ______________ challenge. Choose the best answer to correctly complete the statement above