In India, the term "Public Key Infrastructure" is used in the context of

1. "Public Key Infrastructure" (PKI) refers to a system designed to manage digital identities and enable secure electronic transactions and communications. 2. It involves a set of hardware, software, policies, personnel, and procedures needed to create, manage, distribute, use, store, and revoke digital certificates and manage public-key encryption. 3. The core purpose of PKI is to establish trust in digital interactions, authenticate users/devices, ensure data confidentiality and integrity, and facilitate non-repudiation through digital signatures. 4. Therefore, in the context of India (and globally), PKI is fundamentally used as part of the Digital security infrastructure. 5. Options (B), (C), and (D) relate to different types of infrastructure (food, health/education, telecom/transportation) where PKI might be *applied* for security, but PKI itself *is* a component of the digital security infrastructure, not these other types.