Question: What is the terminal's behavior regarding extra guard time, as indicated by TC1 in the ATR, when sending characters to a UICC?
Option 1: The terminal must always support extra guard time if indicated by TC1.
Option 2: The terminal may choose to ignore TC1 and use a default guard time.
Option 3: The terminal is required to negotiate an alternative guard time with the UICC.
Option 4: The terminal does not need to support extra guard time when sending characters, regardless of TC1's indication.
Explanation: According to the specifications, when sending characters from the terminal to the UICC, no extra guard time (as might be indicated in TC1 of the ATR) needs to be supported by the terminal. This aligns with efficient communication protocols where unnecessary wait times are minimized unless explicitly required for other scenarios or interfaces not applicable here.