Only the top card of my opponent's security card is face up. If this card's [On Play] [When Digivolving] effect activates, what security card is flipped to face up?

What happens to cards placed face up in the security stack by effects?

What happens upon a security check for a security card that is placed face-up?

Does a card's [Security] effect trigger upon a security check with that card placed face-up?

What happens if I shuffle a security stack that includes security cards placed face-up?

In what order do a [Security] effect, "when [...] performs a security check" effect, and "when a card is removed from [...] security stack" effect activate when they trigger simultaneously upon a security check?

If I attack with this card, an opponent's face-up security card is checked for the security check, then this card's [Your Turn] effect activates and I place the top card of this Digimon at the bottom of the security stack, does the [End of Attack] effect on the Digimon under this card trigger?

An opponent's Digimon attacks a player by an effect at the end of their turn. What happens if this card's {Security} [End of Opponent's Turn] effect then plays this card, my security stack is reduced to 0 cards, and the attack against the player is successful?

What happens if this card has just BT15-086 [Marvin Jackson] in its digivolution cards, it performs a security check on a face-up security card, and this card's [Your Turn] effect activates?

This card has EX11-041 [Oblivimon] in its digivolution cards, it gained <Security A. +1>, and it attacks a player. At such times, if the [Your Turn] effect activates upon the 1st face-up security check and this card's top stacked card is placed as a security card, do I use EX11-041 [Oblivimon] to perform the 2nd check?