Question: What is the minimum clock frequency required by the SIM to process an ENVELOPE command for SIM Data Download or run the authentication procedure, and how is this requirement indicated in the file characteristics?
Option 1: 9/4 MHz, indicated by setting bit 5 of byte 2 to 0
Option 2: 13/4 MHz, indicated by setting bit 2 of byte 1 to 1
Option 3: 13/8 MHz is always sufficient and no special indication is needed in the file characteristics for any operation
Option 4: 19/8 MHz, indicated by setting bit 7 of byte 3 to 1
Explanation: According to the specifications, a clock frequency of 13/4 MHz is required for specific operations like running the authentication procedure or processing an ENVELOPE command for SIM Data Download. This requirement is signaled by setting bit 2 of byte 1 in the file characteristics to 1, distinguishing it from scenarios where the lower speed of 13/8 MHz might be sufficient.