Consider that B wants to send a message $m$ that is digitally signed to A. Let the pair of private and public keys for A and B be denoted by $K_x^-$ and $K_x^+$ for $x = A, B$, respectively. Let $K_x(m)$ represent the operation of encrypting $m$ with a key $K_x$ and $H(m)$ represent the message digest. Which one of the following indicates the CORRECT way of sending the message $m$ along with the digital signature to A?

To create a digital signature:

1. The sender (B) creates a hash/message digest $H(m)$ of the message $m$.

2. The sender (B) encrypts the digest $H(m)$ with B's own private key $K_B^-$, producing the signature $K_B^-(H(m))$.

3. The sender sends both the original message $m$ and the digital signature: $\{m, K_B^-(H(m))\}$.

The receiver (A) can verify the signature by decrypting $K_B^-(H(m))$ using B's public key $K_B^+$, calculating $H(m)$ independently from the received message $m$, and comparing the two.

Therefore, (B) is the correct option.