Partially obfuscated account number. How to represent?

Please let me know your thoughts on which way of partially obfuscated account number you would use (in a payment application) and why.

Masking all digits except the last four: Account Number: **********4986

Specifying in the label that only the last four digits are shown: Account Ending In: 4986 or Account Number (Last 4-digits): 4986