Which directory is created by the idemixgen tool along with the ca directory and msp directory when configuring membership?

The​idemixgen​tool is used to create configuration files for the Identity Mixer based MSP

(Membership

Service

Provider)

in

Hyperledger

Fabric.​When

configuring

membership,

the​idemixgen​tool creates three directories:​/ca/,​/msp/, and​/user/1. The​/ca/​directory contains

the issuer secret key, issuer public key, and revocation key, which should only be present for a

Certificate Authority (CA). The​/msp/​directory contains the issuer public key and revocation public

key, which are required to set up an MSP that verifies Identity Mixer signatures.​The​/user/​directory

specifies a default signer configuration1. Therefore, the correct answer is the user directory, which is

created alongside the ca and msp directories by the​idemixgen​tool.