A security analyst is implementing PKI-based functionality to a web application that has the following requirements:

• File contains certificate information

• Certificate chains

• Root authority certificates

• Private key

All of these components will be part of one file and crytptographically protected with a password. Given this scenario, which of the following certificate types should the analyst implement to BEST meet these requirements?

• .pfx certificate

• .cer certificate

• .der certificate

• .crt certificate